Farmgirl, congrats on your pool install, enjoy something you have wanted for so long. Yes, all types of liners can pull loose. Beaded liners are well known for coming out of the bead reciever. Special plastic inserts are made to keep them in place in touble areas. Because the bead reciever is also a strong retaining rod the liner will usually pull out of the bead, or tear just under the bead, before it brings the wall down. A j hook liner is held in place by a good retaining rod also. That might be a tough pull as to what would give first. Overlap liners usually pull free of the wall but some retaining rods have an extra tight grip and the walls will pull down.

The number one lesson learned. There is only one reason to drain a vinyl liner pool, if you are going to change the liner. All vinyl liners will shrink when left empty, even for a day. refilling could be a problem.

Dennis