A pool that needs topping up every few days is not simply inconvenient. It can waste treated water, increase chemical use and, if ignored, cause damage around pipework, paving or the pool structure itself. This leaking pool repair example shows how a methodical inspection can find the true source of water loss before a minor issue becomes an expensive renovation.
The call-out: a villa pool losing water every day
The owner of a villa noticed that the water level had dropped by roughly 25 mm over three days. At first, the loss was put down to hot weather, swimming and evaporation. However, the same level of loss continued during a quieter period when the pool was covered and barely used.
The pool was a tiled concrete construction with a skimmer, return inlets, underwater lights and a separate plant room containing the pump, filter and salt chlorinator. There was no obvious wet patch beside the pool, no visible crack in the shell and no clear fault at the equipment. That is a common situation. Water often travels through soil or drains away beneath paving, so the point where it escapes is not always where the evidence appears.
Rather than guess, the repair began with proper leak detection. This is usually the quickest route to a cost-effective solution, especially for second-home owners and property managers who need a clear diagnosis and practical next step.
First, rule out normal evaporation
Evaporation varies with temperature, wind, humidity, pool heating and whether a cover is used. A heated pool without a cover can lose considerably more water than a shaded, covered pool. That is why a visual estimate alone cannot confirm a leak.
A simple comparison test can help. A container of pool water is placed on a step so its water level is level with the pool water. After 24 hours, the levels are compared. If the pool has fallen noticeably more than the container, the extra loss points to a leak rather than evaporation.
In this case, the test confirmed abnormal water loss. The next question was more useful: was the water leaving through the structure, the fittings or the circulation pipework?
A leaking pool repair example with pressure testing
The first stage was to inspect the pool and equipment while the circulation system was operating. The plant room was checked for drips around unions, the pump lid, filter connections, multiport valve and waste line. A small drip at a pump connection can be easy to overlook, but it should still be repaired because air can be drawn into the system when the pump stops.
No significant loss was found at the equipment. The pool was then tested with the pump switched off. The water still dropped, although more slowly. This suggested there could be a structural leak or a fault in a line that was losing water under static conditions.
The skimmer, return lines and other pipe runs were isolated and pressure tested. Pressure testing is valuable because it identifies whether a sealed line can hold pressure. If it cannot, there may be a split pipe, failed joint or damaged fitting underground. It avoids unnecessary digging and helps target any excavation precisely.
In this example, the return line held pressure, but the skimmer line showed a gradual loss. That narrowed the investigation from the whole pool to one particular section of pipework and its fittings.
Finding the fault without draining the pool
The skimmer was inspected closely, including the faceplate, screws and seal between the skimmer throat and the tiled finish. A small failure in this area can allow water to pass behind the fitting, particularly when the water level sits above the skimmer opening.
A dye test was used around the suspected area. With the pump off and the water still, a small amount of dye was introduced near the fitting. The dye was drawn slowly into a narrow gap at the lower edge of the skimmer faceplate. This confirmed a leak at the seal.
There was also evidence of a minor issue in the skimmer pipe connection. The repair therefore needed to address both faults, rather than replace a seal and hope the problem had gone away. This is where experience matters. A leak can have more than one cause, particularly in an older pool with original fittings and pipework.
Because the work was below the waterline, the pool did not need to be drained. An underwater repair was carried out to renew the fitting seal, secure the faceplate correctly and repair the accessible pipe connection. Keeping the water in the pool saved time, reduced water waste and allowed the owner to continue using the pool shortly after the repair had cured.
Why an early repair costs less
A leaking skimmer seal may appear small, but continuous water loss adds up. Fresh top-up water changes the chemical balance, requiring additional salt, chlorine or other treatment products. If a pool is heated, the cost can rise further because cold replacement water must be heated again.
There are wider risks too. Persistent leaks can wash away soil around the pool, undermine surrounding finishes or find a route into electrical conduits. With tiled pools, movement caused by saturated ground can eventually lead to cracked grout, loose tiles or more substantial repairs.
A prompt diagnosis is usually more economical than repeatedly topping up the pool and waiting for visible damage. The right repair depends on the fault. A worn skimmer seal is very different from a cracked return line, damaged light conduit, failed main drain connection or a structural crack in the shell. Each requires a different approach, scope of work and quote.
Signs your pool may need leak detection
Some water loss is expected, but it is sensible to arrange an inspection if the level drops faster than usual or you are adding water more often than normal. Other warning signs include air bubbles returning to the pool, a pump that repeatedly loses prime, damp ground near the pool or plant room, loose tiles, cracking around fittings, and a sudden increase in chemical consumption.
Pay attention to the water level itself. If it consistently stops falling at the same point, that can offer a clue. For example, water stopping at the bottom of the skimmer may indicate a skimmer-related issue. A level that falls below a light fitting and then stabilises may point towards that fitting or its conduit. These clues are useful, but they are not a substitute for testing.
Avoid adding sealants blindly or repeatedly turning the pump on and off in an attempt to diagnose the issue. Some products can affect filtration or make a later professional repair more difficult. Equally, turning off circulation for too long can compromise water quality in warm conditions.
Repairing the cause, then protecting the pool
Once the repair was complete, the skimmer line was re-tested and the pool level was monitored over several days. The abnormal loss stopped. The owner also chose to review the pool cover, as a good electric, solar or manual cover reduces evaporation and keeps the water cleaner between visits.
A repair appointment is also a useful opportunity to check older equipment and finishes. Worn grout, poorly sealed fittings, ageing valves and tired pipe connections do not always need replacing immediately, but identifying them early helps you plan maintenance rather than face an urgent breakdown during the busiest part of the season.
Paradise Pools and Gardens can investigate water loss with targeted leak detection and pressure testing, then carry out practical repairs including underwater work where suitable. You receive a clear assessment of what has been found, what needs attention now and what can be planned for later.
If your pool is losing more water than the weather can explain, arrange an inspection before the issue spreads beyond the original fault. A precise repair protects your water, your outdoor space and the time you want to spend enjoying it.