Water loss

Nathan J

Member
May 19, 2020
6
Northwest Arkansas
For the last several years, we have experienced water loss of 1/2 inch up to an inch a day in our inground pool. At least 3 different professionals have done pressure testing with no luck in finding a leak. This year, the pool was not losing water, until last week. Yesterday it lost 7/8 inch. Any ideas on why it would hold water for 4.5 months since opening this year and then start losing again?
 

Nathan J

Member
May 19, 2020
6
Northwest Arkansas
Update #2 - 13 hours with pump off, pool lost over 1/2 inch. I realize there is a leak, but why would the leak that had been present in the past stop leaking for nearly 5 months and then start back up again?