I think I have a Happy bottom. I forget. My AG 18ft round pool is on 2 inches of sand and was perfectly smooth and tamped when installed. A day after the install and for about a month, it rained (last year) and the floor got many bumps in it. The whole floor looks and feels like dimples on a golf ball. Big dimples of course. Just wave upon wave of floor. I think the water got under the pool somehow and caused this. I didn't have all the water in the pool for the first few days of install, as I was waiting to plumb it.
So anyway, it has been like that ever since and nothing has happened.... yet. This year will be the first opening I have since the first close last Fall. Any opinions?
Also, can this be fixed? Would I need to take the liner off? If so, forget it. lol It's a beaded liner btw, but I'd rather not if it's OK like this. thanks.