Centurion · Same-day response
Pool Leak Detection in Centurion — the Clay-Heave Story
Every pool leak specialist working in Centurion learns the same thing in their first month: this is not a suburb where you look at the water and guess where it's going. Centurion sits on some of the most reactive clay in Gauteng. Through the summer the clay swells with moisture; through the winter it shrinks. Between those two states, over five, ten, twenty years, a pool shell that was poured perfectly level in 2005 is now under uneven load. The bond beam cracks. The tile mastic separates. The plumbing that runs under the skimmer box moves half a centimetre away from where it was installed. That is the physics behind the majority of the pool leaks we confirm in Centurion — and it is why our first question on the phone is not "how much water are you losing?" but "when was the pool built, and has your driveway cracked recently?"
Because we know the ground under Centurion so well, we know where to look before we arrive.
The single-pump pressure inspection, walked through
A Centurion pool leak detection is R2,150 flat for a full single-pump inspection. That price covers every step below.
We start with a bucket test if the losing rate is unclear — a floating bucket of pool water alongside the pool line for a couple of hours confirms whether the loss exceeds normal evaporation. In practice most Centurion clients already know they're leaking; on those we skip the bucket and go straight to the pressure work.
The heart of the inspection is the three-circuit isolation. Every pool has three plumbed circuits — suction (skimmer and main drain), return (the jets), and dedicated (spa, waterfall, hose bib if plumbed). Each gets tested independently. We cap the returns, isolate the suction, pressurise to two bar, and watch the gauge for a full six minutes. A leak on any one circuit shows as a measurable pressure drop within the first minute; a slow bond-beam leak shows over the full six.
Once the pressure work identifies which circuit is losing (or that all three hold, which means the loss is above the shell), we run a dye test on the shell where the pressure work has narrowed the search. Fluorescein dye draws to the crack; on a clean day a hairline in the bond beam shows in a few seconds.
If the leak is in the plumbing rather than the shell — as it often is in Centurion homes with wide, landscaped pool decks — we then trace by tracer gas. The hydrogen–nitrogen mix rises through paving joints exactly where the pipe is open. We recently traced a Doringkloof complex leak in about twenty minutes this way.
The most common Centurion pool leaks, from ten years on the road
Bond-beam cracks are number one. The shell moved with the clay, the mastic gave, and now the pool loses a couple of centimetres a day. Retiled shells are especially prone — the retile itself doesn't re-bond the concrete underneath if the shell has already moved.
Skimmer-throat seals are number two. On 1990s and early-2000s builds the throat seal is a rubber gasket set in mastic; both perish over time. When the clay heave lifts the deck around the skimmer, the gasket fails first.
Hydrostatic-valve leaks are number three, particularly on Centurion pools built into raised decks. The valve is designed to relieve ground-water pressure on the shell — over the years the seat wears, and pool water flows the wrong way through it whenever the water table drops.
Pricing, report, and what happens next
R2,150 covers the full session, a photographic report emailed within two business days with numbered findings, and a repair quote for whatever we found. On confirmed leaks — a pressure test that fails — we cannot locate using our full detection kit, you receive a full refund under the No Find, No Fee guarantee. Please read the pool leak detection service terms before your appointment so the prep is right.
Prep for a Centurion pool inspection
- Water level filled to about halfway past the skimmer opening — too low and the skimmer can't be pressure-tested; too high and the dye test is meaningless.
- Water clear enough that you can see the pool floor from the deck.
- Pump and multiport valve functional — we need to run individual circuits under pressure and open valves under normal flow.
- Enclose dogs, and let us know at booking about any unusual fittings — waterfall spouts, breather ports, in-floor cleaning heads — because some can't be blanked off with our standard kit and the test result changes accordingly.
Frequently asked questions — Centurion
Our estate manager says we can't dig on the shared verge until you confirm the leak. Does your report cover that?
Yes — on estate stands we specifically document which side of the meter (customer or estate reticulation) the leak sits on, with GPS coordinates on the pinpoint. Every managing agent in Centurion we've worked with has accepted this format for authorising the trench.
The pool was retiled two summers ago and started losing water a month later. Is there a connection?
Very likely. Retiling that doesn't re-bond the shell can pull hairline cracks in the bond beam open again — the tile bed masks the crack visually but the pressure test finds it. On a Centurion pool with reactive clay underneath, retile-related leaks are unfortunately common. We diagnose on a single visit whether the shell or a fitting is at fault.
We top up the pool with borehole water because of municipal outages. Can you still work?
Yes, though borehole water sometimes clouds the pool enough that the dye test needs a longer settle. If we can see the floor clearly from the deck, we can work. If the water's very milky we may swap to a leak-detection dye that shows better in cloudy water — no additional charge.
Winter is coming, we drain the pool in June every year. Is that a bad idea?
In Centurion, generally yes. Draining a shell that sits on reactive clay puts the pool at risk of shell shift — the water was holding it in place against the ground pressure. If you must drain, do it fast, clean fast, refill fast. If you're regularly losing water and considering the drain-and-repair route, book us first — we'd rather find the leak than see the shell crack when it's dry.
What's the difference between your inspection and my pool cleaner's inspection?
Pool cleaners usually visual-inspect the shell and check the pump. That catches obvious leaks. What they can't do without our kit is pressure-isolate each circuit, run tracer gas through paving, or measure the loss down to a decilitre. That's what R2,150 buys you — a diagnostic-grade answer, not a maintenance-grade one.
No Find, No Fee
On a confirmed leak — meter turning with taps closed, or a measurable pressure drop on your pool circuit — if we cannot locate the source, you receive a full refund.
Read the full No Find, No Fee terms →Book online
The wizard takes about 60 seconds — we'll email a callout confirmation and follow up on WhatsApp.
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