I have an IGP with attached whirlpool, total about 17,000 gal. There are two returns in the pool and one in the whirlpool. One, or both pool returns have a leak. I've turned the pump off, plugged the two pool returns, closed the valves on the return pipes in the pump house, marked the water level and the level remains constant after 24 hours.
When I open the valves in the pump house, with the returns remaining plugged, and pump still off, the pool water level decreases. There is no water in the pump house nor from the pump drain pipe.
Thanks for any thoughts regarding this problem, Tom