Thought we had taken care of our leak earlier this summer when we found a hole in our liner and patched it. I have verified that the patch is holding but we are still losing water beyond evaporation. I have a fancy leak detector bucket that verifies this although we definitely lose more during the day when the pump is running than we do overnight. Total is a little over 1/2 inch per day which isn't a huge amount but does require an 1100 or 1200 gallon fill every six or seven days to keep the skimmers functioning. As far as leak detection in pool school...I see how I can plug inlets and outlets in the pool vessel with the exception of the main drain so I have these questions:
1. If the idea is to isolate the pool vessel, can't I do that with valves on the return side or is it possible for water to flow backward in the line from the pool?
2. With plugs, I see how I can plug skimmers, returns and vac lines but I am not sure how I would plug the main drain (two inlets with covers into one line back to pad). Even if there is a normal fitting under the covers, the water is getting pretty cold pretty fast and I am a wimp.
Leak detection service will not guarantee they can find a leak less than 1" per day but they guarantee they will cash your $400 check anyway. Any ideas on how to approach this one??