I have inspected as best I can and cannot find any visible tears or punctures in the liner that would indicate a leak. I filled up the pool with enough water to raise the level about 2 inches, and it lost all of that in the least 48 hours, so there is definitely a leak.

Does anyone out there have any other advice or ideas on how I should approach this situation? Break down and call a pool company to inspect it? Help greatly appreciated.
A