My first year closing pool, decided to use pool cover although dont have alot of trees nearby. My question is the water level, the cover directions suggest water being no more than 6 inches below top of pull. I'm sure I need to drain below skimmer and return to prevent cracking the plastic, is this correct. Can anyone suggest proper methods for my pool, it is a 24ft round with single skimmer and return which have push on plastic piping with pipe clamps. I would of course remove these pipes to clear them from freezing but don't know the best way to plug the bottom of skimmer housing and return which is about a 1 3/4" or whether to even drain below return, that would add several more inches the cover would have to sit down on the water.