Edit so removed bottom foam from edge and pool is pretty shot so 3rd post on will just be how i fixed for now. Pool needs too much work to properly fix where might as well buy new one so just going to do what i feel will work best to at least work for this season.
So i made it thru last season with patching 40 holes in liner but now it is time to replace. Pool was empty when i bought house. Liner held water thru winter but failed this spring to point i decided to buy a new liner.
There is a foam bottom but it is very uneaven but it works. It is a butress free oval pool 15x30 and the bottom plates stick up under pool as it seems it was not installed correctly with thick enough base of sand however i know others have had same issue. Even once nice and flat the pressure of the water on the sides causes the bottom plates to stick up.
I am tempted to clean foam and install new liner because i know to re-level will be a lot of work and if its not even im end what was point. I can get more pics i next post.
Thinking i should remove foam bottom and add sand but seems i will need a lot of sand to cover bottom plates.
Or just install new liner and swim...
Went with plain 25g overlap liner and new cooping strips for about $200 so not a lot invested.
Have a intex SWG with sand filter and pump system.