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Find a Leak in a Concrete Swimming Pool

Find and hopefully then repair a leak in a concrete swimming pool. I've no idea what this will cost. Pool is hot water bore fed, quick to empty and fill, built mid 1970’s. Approx. 9x5 m and 1m deep with a deeper pit. Resurfaced 4 years ago with AquaBright EcoFinish. I’ve left it for 30 hours to see where water drops to. It is now approx 5cm above the large outlet on left of photo. The only fittings left in the pool below the current water line are the large syphon exit on left of the photo and the two exits at the bottom of the pit. The large white one has recently been replaced as the thread on the bung was badly worn. The smaller one is the exit to pump. The pool level is now dropping very slowly compared to when full. A 5cm drop in the last 4 hours. It’s a humid day – 88% RH and no wind, so minimal evaporation