My pool is a 30x54 we have had it for about 7 years we have never had any problems. We completely drained the pol this year and we added sand around the edge where the liner is slipping we started filling it up and it started slipping again we have drained it 3 times I only let about 5 inches of water in until it starts slipping what is wrong thank you LIsa

Hey hon. I don't know the exact reason. But I had this issue before and I was told it was over filled. If that's not the problem than I'm sorry I can't help more