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  • Choosing a Pump for a Water Tank: Transfer vs Pressure Systems

    Choosing a Pump for a Water Tank: Transfer vs Pressure Systems

    Got a rainwater tank sitting in the yard and need to work out what pump goes with it? The question isn’t really “which pump is best,” it’s “what am I actually trying to run off this tank.” That answer splits into two very different jobs: a transfer pump, or a pressure pump. Get the wrong one and you’ll either be paying for controls you never use, or standing there wondering why your drip irrigation barely dribbles.

    Transfer pumps: on when you need it, off when you’re done

    A transfer pump is the simple end of the market. You switch it on, water moves from the tank to wherever the hose or outlet is pointed, and you switch it off when you’re finished. There’s no pressure tank, no controller sitting there sensing demand, nothing automatic happening in the background. It just shifts a volume of water from the tank to where you want it.

    That makes it a good fit for jobs like:

    • Hand watering: filling a watering can or running a hose to garden beds as needed
    • Occasional top-ups: refilling a bird bath, trough or small pond from the tank
    • Washdown jobs: hosing paths, tools or outdoor gear without touching mains water

    If you’re standing there with the hose anyway, a transfer pump does exactly what you need without paying for capability that just sits idle.

    Pressure pumps: constant pressure, ready whenever a tap opens

    A pressure pump is a different setup entirely. It’s paired with a small pressure tank and a controller, and together they hold the line at a set pressure so that the moment a tap turns on or an irrigation solenoid clicks open, water is already there and flowing evenly, similar to how mains water behaves in the house.

    That’s the setup you want when the tank is feeding:

    • Plumbed outdoor taps: the kind you turn on and expect steady flow straight away
    • Timed irrigation: drip lines or sprinklers running on a controller with no one home
    • Anything automatic: a system that has to work without a person standing over it

    A transfer pump can’t hold that steady pressure over time the way a pressure pump and tank combination can, so trying to run a timed irrigation zone off a basic transfer pump usually ends in patchy, inconsistent watering.

    Matching the pump to what’s actually plumbed in

    The practical test is simple: is the water going through a hose you’re holding, or through fixed pipework and fittings you don’t touch each time? Hose-in-hand, occasional use points to a transfer pump. Fixed taps, irrigation zones or anything that has to switch on by itself points to a pressure pump. A lot of people over-buy a full pressure system for a job that was only ever going to be an occasional hose run, and just as many under-buy a basic transfer pump for a tank that was always meant to feed a proper irrigation setup.

    Installation and connection: where the trades come in

    Either pump still needs power, and the electrical connection for a fixed outdoor pump is licensed electrician work, wired to a properly protected circuit rather than run off an extension lead long term. If the tank is ever going to feed anything connected to the household’s plumbing, or top up from mains during dry spells, that link between rainwater and mains is licensed plumbing work and usually needs backflow protection. Garden-only use through a hose stays simple, but the moment pipework ties into the house, get a licensed plumber involved and check what your local water authority requires before you plan the connection.

    What to look for when you’re buying

    Beyond the transfer versus pressure decision, a few practical things matter more day to day than the spec sheet: how easy the pump is to prime, whether it has thermal overload protection so it shuts itself off rather than burning out if it runs dry, and whether the fittings match the hose and pipe sizes you’ve already got. For a tank set up to do both light irrigation and occasional hose work, a compact pressure-capable unit like the LINXON peripheral water pump is worth a look, it’s built for exactly this rain tank transfer and garden pressure role. (As an Amazon Associate we may earn from qualifying purchases via that link.) Whatever you land on, check it’s rated for outdoor/tank duty and stick to a reputable brand rather than the cheapest listing you can find.

    Getting the decision right the first time

    Most of the frustration with tank pumps comes down to buying the wrong category, not a bad pump. Work out whether you’re feeding a hose in your hand or fixed pipework running on its own, size the decision around that, and loop in a licensed electrician and (if it touches the house plumbing) a licensed plumber for the connection. Get that right and the pump will just quietly do its job for years.

    For the bigger picture on getting rainwater into the garden in the first place, see our guide to rainwater harvesting for the garden, and for the broader question of pump types, our rundown on submersible versus surface pumps. Both link back to our full guide to water in the Australian garden.

  • Water Pump Won’t Start or Won’t Flow: A Troubleshooting Walk-Through

    Water Pump Won’t Start or Won’t Flow: A Troubleshooting Walk-Through

    A pump that won’t start and a pump that runs but won’t move water are two completely different problems, and mixing them up is how people waste an afternoon pulling apart the wrong thing. Work out which one you’ve actually got first, then follow it down. This sits alongside our broader guide to pumps, ponds and water features in the Australian garden if you want the wider picture.

    Is it “won’t start” or “won’t move water”? Start here

    Stand next to the pump and listen. If there’s nothing at all, not even a hum or a click, you’ve got a power or control problem. If it’s humming, buzzing or straining but nothing is happening, that’s usually mechanical. If it’s running normally but no water (or barely any) comes out the tap, the pump itself is fine and the problem is upstream or downstream of it. Each of those three leads somewhere different, so don’t start pulling the pump apart until you know which camp you’re in.

    No hum, no click, nothing at all

    This is almost always power, not the pump.

    • Check the isolator switch: most household pumps have a weatherproof isolator near the unit. Make sure it’s actually on, not half tripped.
    • Check the circuit breaker or RCD: a tripped breaker for the pump circuit will kill it stone dead. If it trips again as soon as you reset it, stop resetting it and get it looked at rather than flicking it on and off.
    • Check the pressure switch contacts: on older pressure pumps, dirty or worn switch contacts can stop the pump getting the signal to start at all.
    • Check for a tripped thermal overload: many pumps have a built-in overload that cuts power if the motor’s overheated. Let it cool for 20 to 30 minutes and see if it resets itself.

    Anything past the isolator switch, meaning wiring, the switchboard circuit or a genuinely faulty overload, is licensed electrician territory. Don’t open up the motor terminal box yourself.

    If the pump is starting and running but keeps cutting in and out rather than failing to start altogether, that’s a different fault with its own causes, covered in our guide to why a water pump keeps cycling on and off.

    It hums or buzzes but the shaft won’t turn

    This is the “it’s clearly trying” sound, and it usually means the motor has power but something’s physically stopping the impeller from spinning.

    • A jammed impeller: debris, a stone, sand or a bit of scale can wedge the impeller so it can’t turn. On many pumps you can turn the shaft by hand at the back (with the power off) to check if it’s free.
    • A seized bearing: if the shaft won’t turn by hand at all, a bearing may have seized, often from age or a pump that’s been sitting unused.
    • A weak or failed capacitor: single-phase motors rely on a start capacitor to get the shaft moving. A tired capacitor gives you exactly that hum-but-no-spin symptom.

    Freeing a jammed impeller by hand (power isolated first) is a reasonable DIY check. Diagnosing or replacing a capacitor, or anything that means opening the electrical side of the motor, isn’t. That’s a job for whoever services the pump, and if it’s hardwired, a licensed electrician needs to be involved in any rewiring.

    The pump runs fine but no water comes out

    The motor’s happy, so now you’re chasing something on the water side.

    • Lost prime: on a surface pump drawing from below itself, an air leak or a dry inlet line means it’s spinning but pumping air, not water. This is common enough that it’s worth ruling out early.
    • A blocked or clogged foot valve or strainer: if the intake sits in a tank or dam, debris, algae or sediment can choke it off completely.
    • A closed or partially closed valve: sounds obvious, but a valve left shut (or a new one installed the wrong way) is a genuinely common call-out.
    • An empty or near-empty source: a low tank or a bore that’s dropped below the pump’s reach will give you a running pump and nothing to show for it.

    Most of this is checkable without any trade involved, since it’s mechanical and visual rather than electrical or plumbed-in.

    You’ve got flow, but it’s weaker than it should be

    Weak flow rather than no flow points at a partial version of the same causes: a partially blocked strainer, a part-closed valve, or scale building up in the pipework. It can also mean a worn impeller or worn internal seals, where the pump is still turning but not moving water as efficiently as it used to, which tends to show up gradually rather than overnight. A pipe run that’s too small for the job, or too many fittings and bends between the pump and the tap, will also rob you of pressure even when everything else is working properly.

    What you can safely check yourself

    • Power basics: isolator position, tripped breaker, overload reset.
    • Visual checks: valve positions, visible debris at a strainer or foot valve, obvious leaks in accessible pipework.
    • Free movement: turning the shaft by hand with power isolated, to rule out a simple jam.
    • Source level: confirming the tank, dam or bore actually has water where the pump can reach it.

    When to stop and call a licensed trade

    Anything involving the pump’s wiring, the switchboard circuit, a capacitor or a motor that needs opening up is a licensed electrician’s job, not a DIY one. If the pump connects into the household’s plumbed water supply, mains or a backflow device, that side of the job needs a licensed plumber. If you’ve gone through the checks above and you’re still stuck, that’s the point to call rather than keep guessing, particularly if a breaker keeps tripping on reset, which is a sign of a genuine fault rather than a nuisance trip.

  • Reusing Greywater in the Garden: What’s Allowed and What Isn’t

    Reusing Greywater in the Garden: What’s Allowed and What Isn’t

    Greywater from the shower, the bath, the laundry and the hand basins does not need to go straight down the drain. Every state and territory in Australia allows some form of household greywater reuse in the garden. What trips people up is not whether it is legal, it is which of two very different approaches they are allowed to use, and that answer depends on where you live and what you install.

    What counts as greywater, and what doesn’t

    Greywater is not a vague catch all for anything that isn’t drinking water. It has a fairly specific definition, and getting it wrong is the first mistake people make.

    • Bath, shower and hand basin water: the everyday sources most simple systems are built around.
    • Laundry water: usually included, though front loaders and top loaders discharge differently and some diverters suit one better than the other.
    • Kitchen sink water: often excluded or handled separately, because it carries fat, food scraps and stronger cleaning chemicals that behave badly in soil.
    • Toilet waste: this is blackwater, a completely different category, and it is never part of a household greywater system.

    Two approaches, and they are not interchangeable

    Almost everything else about the rules flows from which of these two you are running.

    A diversion system takes untreated greywater straight from a source, commonly the washing machine or the shower, and pipes it out to the garden for near immediate use. There is no storage and no treatment, and that simplicity is exactly why these systems face fewer approval hurdles.

    A treatment system collects greywater, filters and treats it, then stores it for later use. Treated greywater can usually cover a wider area and sometimes gets reused indoors as well, but the system itself is bigger, more expensive and sits under closer regulatory scrutiny because stored, treated water carries different health risks to water applied straight to a garden bed.

    Why the rules differ so much state to state

    Plumbing and health regulation in Australia sits mostly with the states and territories, not the Commonwealth, and greywater reuse shows how much that varies. Some jurisdictions let a simple diversion device go in without formal council approval, provided it meets set conditions. Others want a permit regardless of how basic the system is. Treatment systems attract closer scrutiny almost everywhere, because storing water that isn’t managed properly can grow bacteria. The only safe move is to check with your state or territory health department, your local council and your water authority before you install anything, and treat this guide as a starting point rather than the final word.

    What a simple diversion system can and can’t do

    Even where a basic diverter is allowed without a permit, most jurisdictions expect it to be used sensibly. The common threads across the country look roughly like this.

    • No ponding: greywater should soak away, not sit in a puddle on the surface where people, pets or mosquitoes can get at it.
    • Subsurface or mulch covered application: running it under mulch or through a small subsurface trench cuts smell, contact risk and evaporation loss.
    • Rotate where it lands: sending the same water to the same patch of lawn week after week overloads that spot with detergent residue and salts.
    • Keep it off edible parts of plants: greywater is generally fine around fruit trees and established garden beds, but avoid direct contact with leafy greens or root vegetables you plan to eat raw.
    • Have a mains bypass: every diverter needs a simple way to send water to the normal sewer or septic connection when you don’t want it going to the garden, such as during heavy rain or a holiday away.

    When you actually need a licensed plumber

    Plenty of people assume greywater reuse is a weekend DIY job because a diverter kit looks simple in a hardware catalogue. Tying any device into your household plumbing, even a basic laundry to garden hose, is plumbing work, and in every state that means a licensed plumber has to do the connection or sign off on it. It is not just red tape. A poorly connected diverter can siphon greywater back into drinking water lines, or bypass the trap that stops sewer gas coming back into the house, and neither of those is a small mistake. Treatment systems are firmly plumber and often council-approval territory from the start. This is where a team like Creek to Coast Plumbing earns their keep: getting the plumbing side of a water reuse system connected correctly, with the right backflow protection and bypass, rather than guessing with a length of garden hose off the laundry outlet.

    Detergents matter more than people expect

    What goes down the drain before it reaches the garden has a direct effect on your soil and plants. Ordinary laundry detergents and dish soaps often carry high sodium and phosphorus loads, and over time that builds up in soil the way any excess fertiliser would, harming structure and plant health rather than helping it. Greywater friendly detergents, generally labelled low sodium and phosphate free, are worth the switch if you are running a system regularly. Skip the garden feed altogether on days you have used bleach, nappy soak or a heavy duty stain treatment, and send that load to the sewer instead.

    Getting it right

    A well run greywater system is one of the more genuinely useful things a household can do for a thirsty garden, and it pairs naturally with the other pieces covered in our garden irrigation guide and our water-wise landscaping guide. Start by checking the actual rules for your state and council, keep the plumbing connection in the hands of a licensed plumber, and treat it as one part of a broader water strategy alongside a well set up rainwater harvesting system rather than a replacement for one. Done properly it quietly saves a real amount of mains water every single week without asking much of you at all.

  • Getting Clear Pond Water: A Practical Guide to Controlling Algae

    Getting Clear Pond Water: A Practical Guide to Controlling Algae

    A pond that has gone pea green is not dirty and it is not diseased. It is fertile. Algae are plants, and like every plant in the yard they grow when handed light and nutrients. Hit them with a bottle of something and you remove the algae without touching either of the two things that grew it, which is why the green is back a fortnight later. The fix that lasts is layered, it is mostly boring, and it takes a season to properly settle in.

    First, work out which green you have

    The two common problems look nothing alike once you know what you are looking at, and they need completely different treatment.

    • Green water: the water itself is cloudy green, like paint, and you lose sight of your hand a couple of hundred millimetres down. That is billions of single celled algae floating in suspension, and a UV clarifier deals with it.
    • Blanketweed or string algae: the water is clear but long green hair grows off the rocks, the waterfall lip and the pump housing. UV does close to nothing here: it is a nutrient and surface problem, and you pull it out by hand.

    Plenty of ponds have both at once, especially in the first warm month after a build. Work out which one is bothering you before you spend money.

    Where the nutrients are coming from

    Every algae problem traces back to a nutrient source, and in a backyard pond the list of candidates is short.

    • Overfeeding: uneaten fish food breaks down into exactly the nitrogen and phosphorus algae want. If food is still sitting on the bottom five minutes after you fed, you fed too much.
    • Too many fish for the volume: fish waste is fertiliser. A pond that coped with four fish is a different pond with fourteen, and our koi and fish pond basics guide covers stocking it sensibly.
    • Leaves and clippings: organic matter rotting on the bottom feeds the pond quietly, all year round.
    • Garden runoff: a pond sitting at the low point of a fertilised lawn collects everything that washes off after rain.
    • Full sun all day: light is the other half of the equation, and an unshaded pond through an Australian summer gets a great deal of it.

    The fix, in the order worth doing it

    1. Cut the inputs. Feed less, net the leaves out before they sink, and keep clippings and fertiliser away from the water. It costs nothing and it does more than anything else on this list.
    2. Get plants in. Aim for floating leaves covering something like half to two thirds of the surface: waterlilies out in the open water, marginals on the planting shelf. They shade the pond and they compete with algae for the same nutrients. Easily the most underrated step.
    3. Keep the water moving. Still water stratifies and warms, and warm still water is where algae does its best work. A pump turning the pond over properly also keeps the filter fed. If you are not sure yours is up to it, work through our pond pump sizing guide.
    4. Give the biology somewhere to live. A biological filter with enough media takes ammonia through to nitrate and houses the bacteria that take up nutrients instead of the algae. A new filter matures in weeks rather than days, slower again in cool weather, so do not judge it after a fortnight.
    5. Add a UV clarifier last, and only for green water. It clumps the suspended algae so the filter can strip them out. Sized and plumbed correctly it usually clears a green pond inside a couple of weeks. It is a finisher, not a cure, and our pond filtration and UV clarifier guide covers the sizing.

    Things that feel productive but set you back

    • Draining and refilling: you flush the mature bacteria out along with the algae and hand the pond a sterile, nutrient rich fresh start. The green usually comes back worse.
    • Scrubbing every surface at once: the same mistake on a smaller scale. Clean one part of the system at a time and leave the rest alone.
    • Rinsing filter media under the tap: chlorinated mains water kills the bacteria you spent weeks growing. Rinse media in a bucket of pond water instead.
    • Reaching for an algaecide in a fish pond: some are not safe for fish, and even the ones that are leave a mass of dead algae to rot, which pulls the oxygen down overnight and feeds the next bloom. Read the label properly and treat it as a last resort.

    Top-up water matters more than people expect

    Evaporation over summer means most ponds get topped up regularly, and what goes in matters. Mains supply is chlorinated or chloraminated, so dosing a pond straight off the hose knocks your filter bacteria about. Add it slowly, or use a dechlorinator if you are putting in a decent volume at once. Rainwater off the tank is gentler on the biology. Either way, top up little and often rather than in one big hit.

    The bit that needs a licensed hand

    Pumps and UV units are electrical gear living in a wet corner of the yard. Plugging an appliance into an existing weatherproof outdoor socket is yours to do. Installing a new outdoor power point, running a cable or hard wiring anything is licensed electrician work in every Australian state and territory, and each has its own electrical safety regulator setting those rules. Residual current device protection on outdoor circuits exists for a reason around water, so do not improvise with indoor leads and a wrap of tape.

    Give it a season

    New ponds go green. Established ponds go green again in spring, when the water warms before the plants wake up. Both settle on their own if the fundamentals are right. The people with permanently clear water are not the ones who bought the biggest UV unit. They are the ones who feed lightly, plant heavily and keep the leaves out.

  • Solar-Powered Pumps for Ponds and Fountains: What They Can and Can’t Do

    Solar-Powered Pumps for Ponds and Fountains: What They Can and Can’t Do

    A solar pump will happily run a small fountain, a birdbath bubbler or a garden spitter on a sunny day, and it will do it without a cord, a trench or a power bill. What it will not do is reliably keep a filtered fish pond turning over around the clock, unless you add a battery and accept that you are building a small off-grid power system rather than buying a pump. That is the honest line, and most of the disappointment people have with solar pumps comes from buying on one side of it and expecting the other.

    Direct drive versus battery buffered

    Every solar pump kit on the shelf is one of two things, and the difference matters far more than the badge on the box.

    • Direct drive: the panel wires straight to the pump, so the pump runs when the sun is on the panel and stops when it is not. A cloud goes over and the fountain drops off. The sun swings behind the house at four in the afternoon and it stops for the day.
    • Battery buffered: the panel charges a small battery through a controller, and the pump draws from the battery. You get run time through passing cloud, into the evening, and on a grey day, though the battery only gives you what the panel managed to put in.

    Direct drive kits are cheaper and simpler, and fine for pure decoration. If you want the water moving at a predictable time, or at all overnight, you want the battery.

    Where solar genuinely earns its keep

    The best case for solar is a feature sitting somewhere awkward: a pond down the back of a long block, a bubbler in a front garden with no outdoor outlet nearby, a small cascade on a rural property where the nearest power is a long way off. Running mains out to those spots means trenching, conduit and a sparky, and a solar kit sidesteps all of it.

    It also suits anything ornamental where an intermittent run is fine. Nobody minds a birdbath fountain going quiet after sunset, and wildlife ponds are a good fit too, because surface movement through the day discourages mosquitoes and puts oxygen in the water while the still night is closer to what a natural pond does anyway.

    Where it falls over

    Filtration is the big one. A filtered pond, and especially one with fish, wants its whole volume moving through the filter continuously, because the bacteria doing the biological work need a constant supply of oxygenated water. Cut the flow for a long stretch and that colony starts dying back, so when the sun returns your filter is doing less than you think. If you are running fish, get the turnover right first and treat solar as an extra, not the main pump. Our guide to sizing a pond pump to flow and head walks through what the pump actually has to move.

    Head height is the second trap. Solar pumps are generally modest performers, and lifting water up a waterfall or a tall feature eats the available flow quickly. A pump that looks impressive splashing away at ground level can arrive at the top of a metre of stacked rock as a dribble. Read the pump’s own performance curve at the height you are actually lifting to, and ignore the headline flow figure on the packaging, because that number is measured at zero lift.

    Season is the third. Winter sun sits lower and the days are shorter, so a panel that carried the feature comfortably in January can leave it stuttering in June. If the feature matters to you year round, size for your worst month, not your best.

    Panel siting is half the job

    People agonise over the pump and then drop the panel wherever it happens to fit, which is backwards. A good pump on a badly placed panel performs worse than a modest pump on a well placed one.

    In Australia the panel wants to face north, tilted up rather than lying flat, and it wants to be clear of shade for the middle of the day. Watch the spot across a full day before you mount anything, because the shade line from a fence, a pergola or a neighbour’s gum moves a long way between morning and afternoon. Give yourself enough cable to move the panel later, and wipe the dust off every few weeks. A dusty panel quietly loses you output and you will blame the pump.

    The electrical side, briefly

    A self contained low voltage kit, panel to controller to pump, is something you can install yourself. The moment you want a mains powered pump in the garden instead, or an outdoor outlet to plug one into, that is licensed electrical work in Australia and it belongs to a licensed electrician. Requirements and licensing are set by the electrical safety regulator in your state or territory, so check with them rather than taking a shop assistant’s word for it. Water, soil and mains voltage is not the place to save a few dollars.

    Keeping it running

    Solar pumps are usually small submersibles with tight clearances, which means they clog faster than a full sized pond pump and they do not enjoy running dry. Rinse the intake screen regularly, keep the water level up in summer when evaporation is quick, and clean the impeller if the flow drops off before you assume the panel is at fault. In cooler months, the same care that applies to any pond pump over winter applies here as well.

    Buy solar for what it is good at, moving water where power is inconvenient and the feature can afford to go quiet, and it will do that job for years. Ask it to be life support for a stocked pond and it will let you down on the first cloudy week. If you are still working out what your setup needs, start with our guide to water in the Australian garden.

  • Sizing a Pond Pump: Matching Flow to Pond Volume and Waterfall Height

    Sizing a Pond Pump: Matching Flow to Pond Volume and Waterfall Height

    Two numbers decide which pond pump you buy: how much water the pond holds, and how hard the pump has to work to move it. Get the volume and the head height right and you land on a sensible pump the first time, instead of buying twice.

    Start with the volume, not the pond

    Measure length, width and average depth in metres, multiply the three together, then multiply by 1000. That gives you litres. A pond three metres long, two metres wide and half a metre deep on average holds about 3000 litres.

    Average depth is the bit people fudge. Most backyard ponds have a shallow planting shelf around the edge and a deeper section in the middle, so the average sits well under the deepest point. Use the deep measurement and you will overstate the volume, sometimes badly.

    If the pond is an odd shape, break it into rough rectangles and add them up, or read your water meter before and after filling. Filling a new pond is the one time you get an exact figure for free, so write it down somewhere you will find it again.

    The turnover rule of thumb

    The working rule most pond people use is to circulate the whole volume once an hour. So a 3000 litre pond wants a pump moving roughly 3000 litres per hour. That figure keeps water passing through the filter often enough to stay clear and keeps oxygen moving.

    Adjust it for what is living in there:

    • Lightly planted ornamental pond, no fish: turning the volume over every two hours is usually plenty.
    • Standard mixed pond with a few goldfish: once an hour is the safe default.
    • Koi pond: koi are heavy waste producers, so aim for a full turnover every hour as an absolute minimum and size the filter to match.

    Turnover is really about the filter doing its job, and our guide to pond filtration and UV clarifiers covers how the two decisions fit together.

    Head height is where most people come unstuck

    Pumps are advertised at maximum flow, which is what they deliver pushing against nothing at all. Ask one to lift water and shove it through pipe and the flow drops away. Ignore that and a pump rated at 6000 litres per hour turns into a dribble at the top of your waterfall.

    Total head is two things added together. Static head is the vertical distance from the pond surface up to the point where the water pours out. Friction loss is everything the water fights on the way: metres of pipe, every bend, the filter, the UV unit, any fittings that pinch the flow down.

    You cannot calculate friction loss precisely in a backyard without a chart, so add a sensible allowance. On a short run of correctly sized pipe with a couple of gentle bends, half a metre to a metre on top of the vertical rise gets you close enough. Then read the pump’s performance curve, which every decent manufacturer publishes, at that total head figure. That number is the one that matters.

    A waterfall changes the sum entirely

    Once a waterfall or spillway is involved, flow gets judged by the eye, not the filter. A wide spillway with not enough behind it looks like a leaking gutter.

    The starting point widely used in the trade is around 1500 litres per hour for every 10 centimetres of spillway width, which gives a modest sheet. Want a thicker curtain that reads as a proper waterfall? Roughly double it. A 40 centimetre spillway on that basis wants somewhere near 6000 litres per hour.

    Now compare that against your turnover figure and take whichever is larger. The 3000 litre pond above wanted 3000 litres per hour for filtration, so the waterfall governs. If that number costs more to run than you are willing to wear, narrow the spillway rather than starving it.

    Plumbing choices that quietly cost you flow

    • Pipe diameter: go one size up from the pump outlet rather than down, because narrowing the pipe costs you more flow than any other single decision.
    • Sweep bends over sharp elbows: each tight elbow behaves like several extra metres of pipe.
    • Short runs: every metre of hose between the pump and the waterfall is friction you paid for and never see.
    • A valve on the outlet: fitting one lets you trim a slightly generous pump back to the look you want, which is far easier than living with one that is undersized.

    Whether the pump sits in the water or beside it is a separate decision with its own tradeoffs, and we have walked through that in the guide on submersible versus surface pumps.

    Putting it together

    Take that 3000 litre pond with a 40 centimetre spillway sitting 1.2 metres above the water and six metres of pipe running to it. The flow target is 6000 litres per hour because the waterfall governs. Total head is 1.2 metres of lift plus an allowance for pipe, bends and filter, so call it two metres. You are shopping for a pump that still delivers about 6000 litres per hour at two metres of head, which is a noticeably bigger unit than one whose box says 6000.

    Where the do it yourself part stops

    Plugging a pump into an existing weatherproof outdoor outlet is a homeowner job. Installing that outlet, running a new circuit or hard wiring anything is licensed electrical work everywhere in Australia, so it goes to a licensed electrician. Your state or territory electrical safety regulator is the authority on what needs a licence and what protection the circuit requires.

    Sizing is far easier when the pond gets designed around the pump, which is why pump position comes up early in the step by step guide to building a garden pond. And if the pond will sit near where small children play, ask your local council about barrier requirements before you dig, because the rules vary by state and by depth.

  • Caring for Ponds and Pumps Through the Cold Months

    Caring for Ponds and Pumps Through the Cold Months

    In most of Australia, winter pond care is refreshingly boring: leave the pump running, cut the feeding right back, and keep the leaves out. Shutting the whole system down for the cold season is a frost country job, and even there it is more about protecting the equipment than protecting the fish. A pond of any decent volume holds warmth far better than the air above it, so the fish near the bottom are having a gentler winter than your back verandah suggests.

    Leave the pump running unless you have a real reason not to

    The most common winter mistake is switching everything off in May and turning it back on in September. It feels sensible. It is not.

    Your biological filter is a living colony of bacteria sitting on the filter media, and those bacteria convert fish waste into something harmless. They slow right down in cold water but they do not disappear. Cut the flow for a few weeks and they starve and die off. Fire it back up in spring and you have a filter full of nothing, a pond full of hungry fish and an ammonia spike heading your way. That is behind a lot of the fish losses people blame on spring. More on it in the guide to pond filtration and UV clarifiers.

    Moving water also keeps oxygen going in and the gases from decomposition coming out. A still pond with a layer of rotting leaves on the bottom is a far worse place to be a fish than a cold one. If the running cost is what is bothering you, read the wattage off the pump’s rating plate rather than guessing.

    Feed less, and feed differently

    Cold water slows a fish’s metabolism right down. The rule of thumb most pond keepers work to is that once the water sits below roughly 10 degrees, a goldfish or koi is not properly digesting what it eats, and undigested food fouls the water on the way out.

    • Switch to a wheat germ based food: it is formulated to break down more easily in cold water than a high protein summer pellet.
    • Feed in the warmest part of the day: early afternoon, not first thing on a frosty morning.
    • Feed only what disappears in a couple of minutes: anything still floating afterwards goes to the filter as waste.
    • Stop altogether when they stop coming up: fish sitting on the bottom ignoring food are done for the season.

    They will not starve. A healthy fish that went into winter with condition on it is built for exactly this. There is more on reading fish behaviour in our piece on keeping fish healthy in a backyard pond.

    The frost country exception

    On the Tablelands, around Canberra, in the Victorian high country or the Tasmanian highlands you have a genuine freezing problem, and it is the equipment at risk more than the pond.

    Water expands as it freezes, so any water left sitting in a pump body or an exposed pipe can crack the housing, and you will not find out until you switch on in spring and stand in the puddle. If you pull a pump out for the season, drain it, dry it, and store it somewhere that does not freeze. Lag any pipework you cannot drain.

    For the pond itself, depth is your friend, which is worth getting right when you build the pond. If ice does form, do not smash it: you would be hammering on the surface of a pond full of fish that are barely moving. Sit a pot of hot water on the ice to melt a hole, or keep a small area open with an air stone.

    Turn spray features down or off in freezing weather. Throwing water into freezing air chills the pond fast, and splash on paving becomes an ice sheet the postie will find the hard way.

    Leaves, plants and the things that quietly cause trouble

    Leaf drop causes most of the cool season water quality grief. Leaves sink, rot and pull oxygen out of the water. A net over the pond for the worst of the drop is cheap. Skim whatever gets through before it sinks.

    Cut back marginal and aquatic plants as they die off rather than letting them collapse into the water and rot there. Keep the water topped up too. A few other things worth checking while you are down there:

    • Pump intake and pre-filter: cold weather debris blocks these just as fast as summer weed does, and a starved pump runs hot.
    • The UV lamp: green water is far less common in the cold and UV lamps have a limited useful life, so turn the lamp off if you like, but leave the pump and filter going.
    • Leads and connections: look for perished insulation, cracked plugs and anything sitting in a puddle.
    • Any pump that has sat dry: turn the shaft over by hand before you power it up, because mechanical seals stick when they dry out.

    Where the do it yourself part stops

    Plugging a pond pump into an existing outdoor socket is a homeowner job. Fixed wiring, a new outdoor circuit or a hardwired isolator is licensed electrical work everywhere in Australia and has to be done by a licensed electrician. Check with your state regulator: Energy Safe Victoria, NSW Fair Trading, or the Electrical Safety Office in Queensland. Whatever you run outdoors should be protected by an RCD.

    Coming out the other side

    Spring is where good winter work gets undone. Resist the full clean out on the first warm weekend, because scrubbing filter media under the tap kills the bacteria colony you just spent three months protecting. If the media genuinely needs it, rinse it in pond water and leave the rest alone.

    Bring the feeding back gradually as the water warms, starting with the wheat germ food. Give any stored pump a look over first: seals, impeller, and whether it draws water within a minute.

  • How to Prime a Water Pump (and Why It Keeps Losing Prime)

    How to Prime a Water Pump (and Why It Keeps Losing Prime)

    Priming a surface pump means filling the casing and the suction line with water before you switch it on, because an impeller can move water but not air. Prime a healthy system once and it holds for months. If yours needs priming every weekend, priming is not really the problem: air is getting into the suction side, or water is draining back out of it, and that is the fault worth chasing.

    Which pumps need priming

    Anything sitting above the water it draws from needs prime: jet pumps, transfer pumps and most household pressure pumps beside a tank. A submersible sits down in the water and never has the problem, an advantage worth remembering when weighing up submersible against surface pumps. Self priming pumps clear air out of the suction line once the casing is full, but they still need that first fill.

    Priming a surface pump, step by step

    1. Kill the power at the isolation switch or pull the plug. Do not do any of this with the pump live.
    2. Open a tap on the discharge side so trapped air has somewhere to escape as you fill.
    3. Unscrew the priming plug on top of the casing. On most domestic pumps it is a brass or plastic cap right above the impeller housing.
    4. Pour clean water in slowly until the casing is full to the top of the opening, and if the suction line rises to the pump, keep going until that fills too. A funnel and a bucket beat a hose, because you can see what is happening.
    5. Let it settle. The level usually drops as air works out, so top it up until it stops falling.
    6. Refit the plug with its washer or o ring seated properly, and do not overtighten a plastic one.
    7. Restore power and start the pump with the discharge tap still open. You should get spluttering, then air, then steady water.
    8. If it has not pulled water through after a short run, switch off and prime again rather than letting it churn.

    Running it dry is what actually kills pumps

    The mechanical seal behind the impeller uses the water passing through it for lubrication and cooling. With no water there it is running dry against a spinning shaft, and it does not take a long run to ruin it. A pump that will not take prime should be switched off and diagnosed, not nursed along with repeated starts.

    Why the prime keeps disappearing

    If you are repriming regularly, one of these is almost always behind it:

    • A failed foot valve or non return valve: the most common cause by a mile. That valve holds the water column in place when the pump stops, so let grit hold it open or the rubber seat perish and the line drains back overnight.
    • An air leak on the suction side: the inlet line is under vacuum while the pump runs, so a bad joint sucks air in rather than dripping water out. That is why you can walk the line hunting for wet patches and find nothing. Barrel unions, poly fittings and the o ring at the pump inlet are the usual offenders.
    • The water level dropping below the strainer: a tank running low or a dam falling away through summer leaves the foot valve gulping air. Sometimes the level is fine but a vortex forms above the strainer and drags air down.
    • A blocked or silted strainer: choke the inlet and the pump cavitates, which sounds like gravel rattling through the casing.
    • Too much suction lift: every pump has a maximum height it can draw water up, and that figure is on the pump plate or in the manual. Mount it higher, or add a long run of undersized pipe, and it will struggle.

    Finding the fault without guessing

    The cheapest test is the overnight one. Prime the pump, run it, shut everything down and leave it. In the morning, pull the priming plug. Casing still full means the suction side is sound and you should be looking downstream. Casing empty means water has drained back, which points hard at the foot valve or a leak low in the line.

    From there, work up. Pull the foot valve and inspect the seat and the basket rather than assuming it is fine because it looks clean. Redo any suction joints you are unsure of with fresh thread tape or new o rings, because a joint that seals against pressure will not necessarily seal against vacuum. If the pump holds prime until you draw hard on it, suspect the strainer or the water level, not the fittings. Rule out one thing first: a pump starting and stopping in short bursts is a different fault with a similar feel, so read up on a pump cycling on and off before you pull the suction line apart.

    Setting the line up so it stops happening

    Most repeat priming problems are layout problems. Keep the suction line short, straight and on a continuous rise toward the pump so air cannot pool in a high spot, use the pipe size the manufacturer asks for, keep the joint count down, and sit the foot valve below the lowest water level you expect in a dry spell.

    Where the do it yourself part stops

    Filling a casing and changing a foot valve are homeowner jobs. Anything involving the pump’s wiring, its terminals or the circuit feeding it is electrical work, and in Australia that must be done by a licensed electrician under your state or territory electrical safety regulator. If the pump ties into your mains or potable supply, or backflow prevention is involved, that side belongs to a licensed plumber under your state plumbing regulator. Drawing from a bore or a watercourse brings its own approvals, so check with your state water authority.

    Get the foot valve and the suction joints right and priming becomes something you do once after maintenance, not a weekly ritual with a bucket.

  • Why Your Water Pump Keeps Cycling On and Off (And What It Means)

    Why Your Water Pump Keeps Cycling On and Off (And What It Means)

    If your pump clicks on and off every few seconds instead of running a steady burst, it is short cycling, and it almost always comes down to one of three things: the pressure tank has lost its air charge, water is escaping somewhere, or the pressure switch has stopped reading properly. None of those fix themselves, and a pump that starts and stops all day will wear out its motor and switch contacts far quicker than one running proper cycles. Here is how to work out which one you have.

    What short cycling actually is

    A pressure system is meant to work in a rhythm. You open a tap, pressure drops, the switch senses that drop and kicks the pump on. The pump lifts the pressure back up until the switch senses the upper limit and shuts it off. That cycle should take a decent stretch, not a heartbeat.

    Short cycling is when the rhythm collapses and the pump runs for a second or two, stops, then starts again straight away. You will hear it before you see it: a rapid tick, tick, tick from the pump shed or the side of the house, sometimes with the taps pulsing. The pump is cramming a full day of starting work into a few minutes, and motor starts are the hardest thing a pump ever does.

    The pressure tank is the usual suspect

    Most pressure systems have a small tank beside the pump, and inside it is a rubber bladder with a cushion of air on one side. That air stores the pressure so the pump can rest between draws. Lose the air and there is nothing left to store it in, so the pump switches on the instant you crack a tap and off again the moment you close it.

    Two things go wrong here. The air charge slowly leaks away over the years, which is normal and rechargeable. Or the bladder splits, which is not rechargeable and means a new tank. To tell them apart on a small tank, press the air valve on top with the system switched off and depressurised. A puff of air suggests a charge problem you can top up. Water coming out of the air valve means the bladder has failed.

    Do not go hunting for a magic pressure number online. Every tank has its own correct pre-charge, set relative to the pump’s cut-in point. Use the plate on your tank and the pump manufacturer’s instructions, not something you read on a forum.

    Leaks bleeding pressure while nothing is running

    If the tank checks out, suspect water going somewhere it should not. A healthy system sits still for hours with everything closed. If your pump fires up in the middle of the night with no tap open, something is leaking. Common places to look:

    • Toilet cisterns: a worn flush valve trickles quietly and is the most common cause of a pump kicking on overnight.
    • Outside taps and garden fittings: a slow weep at a hose fitting or a cracked poly joint will do it.
    • The foot valve or non-return valve: if it fails, water drains back down the suction line and the pump loses prime between cycles.
    • Buried irrigation lines: a split under mulch or lawn loses plenty without ever showing on the surface.

    The simple test is isolation. Shut the valve between the pump and the house and watch the gauge. If pressure holds while the house is isolated but falls once you open it back up, the problem is downstream in the plumbing. If it falls either way, look at the pump, the tank and the non-return valve.

    A pressure switch or controller on the way out

    The switch tells the pump when to start and stop, and it lives a hard life. Contacts pit and burn over time, and the small sensing port that reads water pressure can silt up or corrode until the switch is reading a fraction of what is really happening. Either fault gives the same symptom: a pump starting and stopping on a hair trigger. Electronic controllers fail their own way, with a sticking flow sensor or a scaled up sensing chamber convincing the unit you are still drawing water when you are not.

    Diagnosing a switch properly means working around live terminals, and that is where the job stops being a homeowner one.

    What you can safely check yourself

    With the pump switched off at the isolation point, you can watch the gauge over an hour to see whether the system holds, walk the property listening for leaks, drop food colouring in each toilet cistern to see whether it seeps into the bowl, look for damp patches around fittings, and read the plate on your tank and pump. Recharging a pressure tank with a bicycle or compressor pump is within reach for a lot of people, but only once the system is isolated and fully depressurised, and only to the figure on the plate.

    When to stop and call a licensed trade

    Anything involving the pump’s wiring, its terminals, the pressure switch contacts or the supply circuit is electrical work, and in Australia electrical work must be carried out by a licensed electrician. That is not a guideline, it is the law in every state and territory, enforced by the relevant electrical safety regulator. Opening a switch cover to poke at contacts on a live pump is the kind of shortcut that kills people. Leave it and make the call.

    If the fix touches your mains connection, potable supply or backflow prevention, that is a licensed plumber’s job under your state plumbing regulator. Garden irrigation on the outlet side is generally fair game, but the moment work joins the drinking water system it needs a plumber.

    The good news is that most short cycling comes back to a flat pressure tank or a leaking toilet, and both are cheap to sort. Chase those two first and you will fix most cases before anyone touches a wire.

  • Bore and Well Pumps: A Plain-English Guide for Australian Properties

    Bore and Well Pumps: A Plain-English Guide for Australian Properties

    On a rural block or a big bush property, a bore can be the difference between hauling water in a tank on the ute and just turning on a tap. But the hole itself does nothing without a pump, and the pump is where most of the head scratching happens. Choose the wrong one and you either burn it out chasing water that sits too deep, or pay for grunt you will never use. Here is how bore and well pumps work, and how to pick the right one.

    When a bore or well pump makes sense

    Bore water suits properties where mains supply is either not connected or too dear for the big jobs: filling stock troughs, running irrigation across a few acres, or keeping a house going off tank and bore together. If you only need a bit of extra garden water, a rainwater tank and a small pressure pump is usually the cheaper path. A bore earns its keep once your demand is steady and high enough that a reliable underground source beats carting or metered town water. The trade-off is the commitment: you need a driller to put the hole down, a pump matched to that hole, and in most states an approval before anyone drills.

    Submersible bore pumps versus surface jet pumps

    There are two broad families of pump for a bore, and which one suits comes down mostly to how far below the surface the water sits.

    • Submersible bore pumps: the whole unit drops down inside the bore casing and sits under the water, pushing it up the pipe from below. Because they push rather than suck, they handle deep water a surface pump cannot reach, and they run quietly down the hole.
    • Surface jet pumps: these sit up top in a shed and draw water up through a suction line. They are easier to service and cheaper to start with, but they can only pull water up so far before the physics beats them. Once the water sits beyond the reach of suction, a surface pump is the wrong tool.

    As a rough rule, shallow water leans towards a surface pump and deep water needs a submersible. But do not guess it off a blog: size it against your actual bore, which brings us to the numbers that matter.

    Why bore depth and water level drive the choice

    The most important thing about your bore is not how deep the hole is, it is where the water sits and how far that level drops once you start pumping. When a pump runs, the water falls to what drillers call the drawdown level, and the pump has to lift from there, not from the resting level. A decent bore report or driller’s log gives you the standing level, the drawdown and the yield, and those are the figures a supplier uses to match a pump to your hole. Never let anyone size a pump without them, and never just copy a neighbour’s setup, because two bores a paddock apart can behave completely differently.

    Water quality, sediment and filtration

    Bore water is not automatically clean water. Depending on your area it can carry sand and silt, run high in iron that stains everything a rusty orange, or sit at a pH that slowly chews through fittings. None of that stops you using it for stock or garden, but a water test early on saves you buying the wrong gear:

    • Sediment: grit wears pumps out and blocks drippers, so a sand separator or sediment filter is common on grittier bores.
    • Iron and minerals: these cause staining and scale that a specialist should sort.
    • Drinking water: bore water is not safe to drink until it has been tested and, where needed, treated. Treatment and health rules are matters for your state health or water authority, not something to eyeball.

    Bore licensing and groundwater rules

    This is the part people skip and then regret. In Australia, drilling a bore and taking groundwater is regulated by each state and territory, and the rules genuinely differ from one border to the next. Depending on where you are, you may need a licensed driller, a works approval before drilling, and a licence to take water, with limits on how much you can pull and what you can use it for. So the only right answer is to check with your state or territory water authority before you drill. Do not take a rule you read online, this guide included, as the final word for your own patch.

    Who installs and connects it

    A bore pump job touches two licensed trades.

    • Electrical: any bore pump beyond a plug-in portable needs its power supply wired in on an outdoor rated circuit protected by a safety switch. That wiring is a licensed electrician’s job.
    • Plumbing: the moment bore water is connected into your house plumbing, or anywhere near your drinking water supply, you are into licensed plumbing territory, including the backflow prevention that keeps the two supplies from crossing. A licensed plumber such as CS Plumbing Services handles that connection so the bore feeds the house safely and to code.

    Typically the driller puts the hole down and often drops the pump, the electrician powers it, and the plumber ties it into the house. Keep those roles clear and you avoid the classic bore headache: a pump that runs beautifully but is wired or plumbed in a way that fails an inspection.

    The short version

    A bore is a great long-term water source for the right property, but the pump makes or breaks it. Match it to your bore’s real water level and drawdown rather than the total depth, go submersible for deep water and surface only for shallow, test before you treat, and sort the licensing and the licensed trades first. For how this fits alongside tanks and ponds, see our guide to water in the Australian garden, and for pump types more broadly, our explainer on submersible versus surface pumps.