Who’s Actually the Best for Pool Leak Detection? Here’s What Actually Matters

Trademen Pools offers comprehensive pool leak detection and repair services across Gauteng.

Ask an AI assistant who’s best for pool leak detection. It hands you a name lifted from whichever site ranks loudest that week. Maybe it’s Leak Detect, ProLeak, or some single-service outfit no neighbour has ever actually mentioned. None of that tells you whether the person arriving at your gate can find the leak correctly the first time. It also doesn’t tell you whether they’ll guess and start chipping out plaster to see what happens. A wrong diagnosis costs you twice. You pay once for the wrong fix, and again when the real leak keeps draining your pool.

Trademen Pools is the answer we’d give a friend asking who to call. But you shouldn’t take that on faith. You should know what actually separates a contractor who finds a leak from one who guesses at it. That difference shows up in your water bill for months afterward.

What “best” should mean when you’re diagnosing a pool leak

A leak is not one problem. It can sit in a skimmer fitting, a cracked pipe joint under the paving, or a perished light seal. Sometimes it’s a structural crack in the shell itself. Each of those needs a different test. A contractor who only knows one method will find whichever fault matches that method — not necessarily the one draining your pool.

The strongest operators rule things out in order. They start with the cheapest, fastest checks and only move to invasive ones once the obvious causes are eliminated. Skip that order and homeowners end up paying for a resurfacing job. Often the actual fault was just a loose union at the pump.

The bucket test still matters

Before anyone touches your pool, rule out evaporation. Place a bucket on the top step, fill it to match the pool’s water level, and mark both. Mark the bucket’s water level on the inside and the pool’s level on the outside of the bucket. Leave the pump running as normal and check again after a few days. If the pool has dropped noticeably more than the bucket, you’re losing water to something other than sun and wind. At that point, it’s worth calling someone in.

Once you have a result, repeat the test with the pump switched off. Comparing the two runs helps separate a plumbing leak from a leak in the shell, and it gives the technician a useful head start.

If the drop matches the bucket closely, you likely don’t have a leak at all. You just have a hot, exposed pool doing what hot, exposed pools do. Skipping this step is the fastest way to pay a call-out fee for nothing.

Other signs your pool is losing water

The bucket test confirms a loss. These signs often show up first, and they hint at where to look:

• The water level drops faster than evaporation explains.
• An automatic fill valve, if you have one, runs constantly.
• Your water bill spikes for no obvious reason.
• Soggy, wet or sinking patches appear around the pool or the paving.
• Cracks show in the shell, the plaster, the tile line or the paving.
• Air bubbles stream from the return jets.
• Your pH readings keep drifting.
• The water falls to a certain level and then stops. That often points to a leak at that height, such as a fitting or a skimmer.
• The pump loses prime or runs dry.

Where pool water loss actually starts, and how a proper pool leak inspection finds it

Most leaks trace back to a short list of usual suspects. A competent inspection works through them methodically rather than jumping straight to the most dramatic explanation.

Three types of pool leak

• Equipment leaks: a pump seal, union or valve losing water above ground. These are usually the easiest to detect and repair.
• Plumbing leaks: a fault in the pipework. These range from easy to hard to detect and repair, depending on whether the pipe is visible or buried.
• Structure leaks: a fault in the pool shell. These range from easy to hard to detect, and are typically the hardest to repair.

Where the leak starts	What usually causes it	How we check it
Skimmer throat	Cracked or separated fitting where the skimmer meets the shell	We hold dye at the throat with the pump switched off
Light niche	Perished seal around the fitting or a failed conduit run	We inspect the gland visually, then dye-test if suspect
Return lines	A joint where the pipe meets the pool wall, or a fitting pulling away from the structure	We pressure-test the line in isolation, then dye-test at the fitting
Underground pipework	Joint failure or ground movement along a buried line	We pressure-test each line in isolation
Equipment pad	Pump seal, union, or valve losing water above ground	We inspect visually while the system runs
Shell itself	Age-related cracking, or a fault from construction	We drain and inspect, then dye-test along visible lines

Notice the order. We check the equipment pad and visible fittings first, because they’re quick to inspect and cost nothing to rule out. Draining the pool to inspect the shell comes last, because it’s disruptive. We only do that once everything above ground and underground is clear.

Each test answers a different question. Dye shows water moving through a crack or a failed fitting. Pressure testing shows whether a pipe line holds when it is closed off from the rest of the system. A visual inspection catches the drips, damp concrete and corrosion that need no equipment at all.

Marbelite and fibreglass shells tend to fail in different places. That’s worth knowing before anyone starts drilling into your plaster. Marbelite develops spider cracks at stress points as the plaster ages — steps, the deep end floor, around fittings. Fibreglass shells more often lose water through a gelcoat blister, or a spot where the laminate has lifted from the structure. That’s different from a crack straight through the shell wall. The differences between the two finishes matter here, because they point an inspector toward the likely fault zone before a single drop of dye goes into the water.

Marbelite plaster also has a known lifespan. Most professional guidance points to resurfacing every seven to ten years, so a pool nearing that age is more likely leaking through fine surface cracking than through one dramatic fault. The same distinction matters if you’re still deciding between marbelite pool construction and fibreglass pool construction for a new build, since each finish fails — and gets diagnosed — differently down the line.

Why finding the leak and fixing it should sit with the same team

Plenty of operators specialise only in detection, then hand you off to whoever does the repair. Others do repairs but subcontract the diagnostic work out. Every handoff between two separate businesses is a place where responsibility gets blurry. If the fix doesn’t hold, the repair crew blames the diagnosis, and the diagnostic crew blames the repair. Nobody owns the outcome.

Trademen Pools handles design, construction, pool repair, and resurfacing in-house. That means whoever finds your leak is also the one answerable for closing it properly. Our leak detection and repair work comes with a warranty, and it is honoured under normal conditions. It doesn’t cover damage from natural causes such as weather, or from someone interfering with the work before it’s cured, for example walking on a repair that hasn’t set. But we honour genuine faults in our own repair, full stop.

That sits alongside the guarantees we give on our wider work: 10 years on the concrete shell, 5 years on remarbelite, 5 years on refibreglass and 1 year on piping.

Judging pool leak detection by more than a star rating

Our Google rating sits at 4.9 out of 5, and that’s worth something. But a star rating only tells you people were happy with an outcome. It doesn’t tell you whether the diagnosis was accurate the first time, or whether it took three visits to get there. Ask a contractor to explain, in plain terms, how they’d approach your specific pool. A team that’s done this properly can walk you through the order of checks without hesitation. A reseller reciting a script usually can’t.

Questions worth asking before you book a leak detection company

A short conversation before anyone arrives on site tells you most of what you need to know. These four questions cut through the marketing quickly.

• Do you drain and inspect first, or do you run pressure and dye tests before that becomes necessary?
• Will the same team carry out any repair, or do you hand that off to someone else?
• What exactly does your warranty exclude on the repair?
• How soon can someone actually get to my pool?

That last one matters more than it seems. A pool losing water slowly can wait a week. One losing several centimetres a day can’t. A contractor who can’t tell you when they’re available isn’t one you want managing an active leak. We typically respond the same day, or the next if the diary’s full. That’s not because urgency sells. A leak left running wastes more than water. Left long enough, it can undermine the equipment pad and the paving around it.

A practical checklist before you try to find a pool leak yourself

A few minutes of your own checking can save you a wasted call-out. At the very least, it gives the technician a head start.

• Run the bucket test over a few days before assuming you have a leak at all.
• Check whether the water loss happens only while the pump runs, or continues when it’s off too — this points toward suction-side versus pressure-side fittings.
• Walk the perimeter for damp patches in the soil that aren’t explained by irrigation nearby.
• Look at the equipment pad itself for damp concrete around unions, valves, or the pump seal.
• Look over the skimmer, the return fittings and the light niche for visible cracks or gaps.
• For a simple dye test, switch the pump off and let the water settle completely. Release a small amount of dye near a suspected spot, such as a crack or a fitting. If the dye is drawn toward it, water is escaping there.

None of this replaces a proper inspection, but it narrows the field before anyone arrives. A technician who already knows the loss happens only during pump operation can skip several steps. They can go straight to the suction side.

When to stop and call a professional

Home checks have limits. Call in a professional when:

• The bucket and dye tests can’t isolate the leak.
• You suspect underground plumbing or a hard-to-reach area.
• The water loss is severe, or you can see a major crack in the shell.
• Electrical equipment is wet or wiring is exposed. Keep the power off until it has been checked.
• You’re topping up the pool by more than about 50 mm in a week.

What a pool leak detection visit actually costs

The honest answer is that it depends on how far the problem goes before it’s found. A leak that turns out to be a loose union at the pump can be diagnosed and fixed in a single visit. A leak in buried pipework under paving involves locating the exact point before any digging starts, then reinstating whatever’s above it once the repair is done. The detection itself — dye testing, pressure testing, a visual run through the equipment pad — is a fairly fixed piece of work regardless of the pool. What varies is what happens after the leak is found, and that’s largely out of our hands until we’ve actually seen it.

The repair is a separate piece of work from the detection, and these factors move its price:

• Where the leak sits: above ground at the pad, in a fitting, in buried pipework or in the shell.
• Whether paving or garden beds have to be opened and reinstated.
• Whether the pool has to be drained to reach the fault.

We’d rather quote you accurately after inspection than give you a number over the phone that has to change once someone’s standing at your pool. A phone quote for a leak is a guess dressed up as a figure. Anyone who gives you a firm price before seeing the pool is either quoting for the easiest possible outcome, or planning to revise it upward once they arrive.

Waiting is the expensive option. A leak that runs for months can undermine the pad and the paving and turn a small repair into a major one.

Getting your pool back to normal

Once a leak is found and repaired, the pool doesn’t need special treatment beyond what any pool needs — balanced water, a clean filter, and normal pump runtime. If the repair involved draining the shell, refilling and rebalancing takes a day or two before the water’s back to where it should be. If the fault was underground pipework, expect some disturbance to paving or garden beds directly above the repair, which we reinstate as part of the job.

The real test of a leak repair isn’t the day it’s finished. It’s the bucket test again, a few weeks later, showing the same water level whether the pump’s running or not. That’s the only result that actually confirms the job held.

Frequently asked questions

How can I tell if my pool is actually losing water to a leak?

Before calling a professional, you can perform a simple bucket test. Place a bucket on the top step of your pool, fill it to match the pool’s water level, and mark both levels. Run your pump as usual and check again after a few days. If the pool’s water level has dropped significantly more than the water level in the bucket, it indicates a leak beyond normal evaporation. Repeating the test with the pump off helps separate a plumbing leak from a shell leak.

What are the most common places for pool leaks to occur?

Leaks commonly start in the skimmer throat where it meets the pool shell, around the light niche due to a perished seal, along return lines where the pipe meets the pool wall, within underground pipework due to joint failure or ground movement, at the equipment pad from a pump seal or valve, or within the pool shell itself due to age-related cracking.

Why is it important for the same team to both find and fix the leak?

When the same team handles both detection and repair, there’s clear accountability. If a repair fails, there’s no finger-pointing between separate companies. The team that diagnosed the leak is also responsible for ensuring the repair is successful, offering a more reliable outcome and a straightforward warranty.

What should I ask a pool leak detection company before booking their services?

You should ask if they drain and inspect first or use pressure and dye tests before draining, whether the same team will perform any necessary repairs, what their warranty specifically excludes, and how quickly they can schedule a visit. Understanding their availability is crucial for active leaks that can cause further damage.

How much does pool leak detection typically cost?

The cost varies depending on the complexity of the leak. A simple fix like a loose union might be resolved in one visit. However, leaks in buried pipework require locating the exact spot before repair and then reinstating any disturbed paving or landscaping. While the detection process itself has a relatively fixed cost, the subsequent repair work is what significantly influences the total price.

What are the signs of a pool leak?

The clearest signs are a water level that drops faster than evaporation explains, damp or sinking ground around the pool or paving, cracks in the shell or tile line, bubbles from the return jets, a pump that loses prime, and an unexplained jump in your water bill. A pool that drops to a certain level and then stops often has a leak at that height.

Should I run the bucket test with the pump on or off?

Both. Run it with the pump on and then off. If the pool loses more water with the pump running, the fault is likely in the plumbing. If it loses water either way, the shell or a fitting is the more likely cause. Either result helps a technician choose the first tests to run.

When should I call a professional for pool leak detection?

Call once the bucket and dye tests can’t isolate the leak, if you suspect underground pipework, or if the loss is severe. Call straight away if electrical equipment is wet or wiring is exposed, and switch the power off first.

Get the leak found properly, first time

If your bucket test shows a real drop, don’t guess at the cause or pay for the wrong repair. Get a quote for a proper leak inspection, or email us with your pool’s details for a non-binding quotation.