I have a vinyl liner 32,0000 gallon in-ground pool. It is 20' x 40', with an in-wall light and steps. The liner is less than 5 years old. I have a 1 1/2 hp Hayward pump and DE filter. I have 2 skimmers and 3 returns. My skimmer inlet and MD are in the same skimmer. The pool is 8 1/2 feet...