A very informative thread....sad, but informative. I just recently finished our AG and learned quite a bit, especially about temperature and vinyl. Because the pool face east/west, only 1/2 gets sun and I installed the liner in mid winter. I'll tell you this, "NEVER AGAIN!" It would not stretch and when I did get it to fit...barely, it started to buckle the sides. I waited 3 weeks for a day to exceed 70 degrees and what a difference several degrees made; it stretched like Saran Wrap and no issues what so ever. This was a J-Hook system.

I will ask this however: If for whatever odd reason a person needed to lower their AG water, how low would you say one can do this safely without running into a situation such as liner shrinkage?

Bob-