I have a new pool build going and wanted to make sure the proper size Pentair Quad D.E. filter is installed. The pool is 13,000 gallons and has a Pentair IntelliFlo VSF Pump (3 HP, Pentair # 011056). There's 2 skimmers, 2 drains and 4 returns. I also have a heater (Pentair 400K BTU), Pentair...