In the process of closing my pool i started losing water. After fighting it I quit adding water. In the next two weeks I have lost almost all of my water except the last three feet in the deep end. If it was the underground piping I thought it would stop leaking when it got below the jets and skimmers but no luck. Then I thought if it was the deep end drain on the bottom it would drain all the way out but it has stalled. Any ideas?