Pool Leak Detection
in Pietermaritzburg
A bucket test first, to set rain and evaporation aside. Then the pipes and fittings, one at a time, before any paving is lifted.
Request a call-outPool leak detection in Pietermaritzburg starts with a bucket on the pool step, because summer storms and hot afternoons make the waterline a poor witness. Once the bucket confirms a leak, the pipework, the fittings and the shell are tested separately. You see where the leak is, and what fixing it costs, before anything is lifted.
Six clues, and the part of the pool they point to
What the water is doing tells you which part to test first.
- It drops only while the pump runs
- Usually: the pressure side: the return line, the filter, or a multiport valve passing water to waste.
- Next step: watch the backwash outlet with the pump running, then pressure-test the return line.
- It drops faster with the pump off
- Usually: a suction line, from the skimmer or the main drain back to the pump.
- Next step: plug those lines at the pool and pressure-test each one.
- It stops falling at the skimmer mouth
- Usually: the skimmer throat, where the plastic box meets the shell.
- Next step: a dye test along that joint, with the pump off and the water still.
- It stops falling at the light
- Usually: the light's niche, or the conduit its cable runs through.
- Next step: dye at the niche, then a look at where the conduit comes out.
- Paving beside the pool is wet or sinking
- Usually: a buried pipe leaking into the ground beneath it.
- Next step: pressure-test each line to find which one, then lift paving at that spot only.
- The pump loses prime, or the returns spit bubbles
- Usually: air getting in on the suction side, at the pump lid, a union or a valve. It may not be losing water at all.
- Next step: check the lid seal and the unions before suspecting a buried pipe.
Summer rain hides a pool leak. A bucket does not.
Pietermaritzburg gets most of its rain in the months a pool is used, which is when the waterline is hardest to read.
A pool loses water to the air every day. Sun, warmth and wind all draw it off the surface, and the amount moves with the weather. In Pietermaritzburg, summer adds rain on top: on the South African Weather Service's figures, January averages 155 mm, falling on 22 days of the month.
A pool that storms top up every few days, and hot afternoons draw down in between, can hide a steady leak for a whole season. The dry months turn it around. July averages 2 mm of rain, so nothing replaces what is lost, and once the level falls below the skimmer mouth the pump starts drawing air.
The bucket test sets both aside, because the bucket gets the same sun, wind and rain as the pool. Stand a bucket on the step, fill it to the pool's level, and mark the water inside the bucket and the pool's level outside it. Run the pump as normal for 24 hours, then compare. Whatever the pool has lost beyond the bucket's drop is escaping, through the shell or through the pipes.
- The bucket, on the pool step, filled to the pool's level.
- A mark inside the bucket at its starting level.
- A mark on the pool wall or the skimmer, at the same level.
- The pool's drop after 24 hours. If it is more than the bucket's, the difference is a leak.
Close any automatic top-up valve before you start. Otherwise it quietly replaces the loss, and the only sign is the water meter, which counts every litre it sends (the leak detection page explains how to read it). Strong wind can exaggerate the pool's loss next to the bucket's, so a calm day gives the cleaner result. Then run the test again with the pump switched off.
Once the bucket confirms a leak, the search narrows one part at a time. Pipes are sealed off at the pool and put under pressure one by one. The fittings in the shell are dye-tested in still water. And if the level stops falling at some height, the leak is usually there. Paving is lifted only where a test has put the leak.
Do the bucket test twice, once with the pump running and once with it off, before you phone. Those two numbers tell us where to begin.
How a pool leak gets found
Four steps, and the first one happens before anyone arrives.
The bucket test
Done by you, pump on and pump off, or talked through on the phone first.
Pump end and pipes
The backwash line and valves checked, then each pipe plugged and held under pressure.
Shell and fittings
Dye at the skimmer, the returns, the light and any crack, with the pump off.
Quote, repair, re-test
The leak located and priced, repaired, then a bucket test to prove the pool holds.
Pool leak questions
What the search costs comes first, then the rest.
How much does pool leak detection cost in Pietermaritzburg?
The price follows the size of the system. A pool with one skimmer and one return line is quicker to test than one with a main drain, a light, a water feature and a long run back to the pump. Your bucket test results narrow it down before anyone arrives. You hear how the search is charged first, and the repair is quoted separately once the leak is found.
How much of the loss is just evaporation?
No figure holds for every pool. Sun, heat, wind and shade change it from day to day, and a covered pool loses far less than an open one. That is why the bucket test compares the pool with a bucket beside it on the same day, rather than with a number from a chart.
Does the pool have to be emptied to find the leak?
Yes. The tests are done with the pool full: pipes are pressure-tested from the pump end and fittings are dye-tested under water. Some shell repairs need the level brought down afterwards, and the quote says so if yours does.
Who repairs a crack in the pool shell?
Pipes, valves and the fittings set into the shell (skimmer, returns, light niche) are plumbing, and we repair them. Resurfacing a cracked marbelite or fibreglass shell is specialist pool work. If the leak is in the shell, the report shows where, so a pool specialist can price it without repeating the search.
Why does water run out of the backwash pipe while the filter is on?
Usually a worn seal inside the multiport valve, which lets water slip through to the waste line even in the filter position. It is one of the first things checked, because it looks like a leak but costs a seal or a valve rather than a dig.
Should I keep topping up the pool while I wait?
Yes. Keep the level at the middle of the skimmer mouth so the pump does not draw air and run dry. Note how much you add and when, because that shows roughly how fast the water is going.
Can a leaking pool damage the paving around it?
It can. Water escaping from a buried pipe keeps the ground under the paving wet, and wet ground can soften and settle. A leak found early means a smaller opening, which is one more reason to start with the bucket test.
Will the paving have to come up?
Only at the spot where a test has put the leak, and only after you have seen the quote. Relaying what is lifted is on that quote too, as its own line.
When the water is going somewhere else
A leak in the house rather than the pool, a burst that cannot wait, or a slow drain.
Request a call-out
Say how quickly the level is falling, what the bucket test showed if you ran it, and which suburb you are in. The cost of the search is settled before a visit is booked.