Well, Have not needed to post in a while but I am completely stumped. Losing an inch a day. Did bucket test and only lost 1/16 of an inch in bucket. This is my 4th season with a pool and I have never lost water like this. Plugged skimmer and main drain at different times and still lost water. My skimmer only has one hole leaving the center of the bottom. Plugged return jets and lost water. Paid a scuba diver to come and he found one small hole in liner and repaired it for $150. He guaranteed me that it was the only hole in the liner. The liner is only 2 years old so I believe it. No bubbles in pump basket. No visible water around pool. I have concrete around the pool and it makes me sick to think I might have to tear that up. I think I would consider filling it in if I cant find the leak and it comes to that. Pool was built in 1985. The underground pipe is black poly. Any other ideas or suggestions? Thanks in advance.