Hayward is currently a better choice then Pentair, because Pentair has decided to slash the warranty period on pool equipment not installed by a contractor. A 22" sand filter would be ideal . . . but you are only looking for a 40 GPM flow rate. Higher flow than that will cause filtration to deteriorate, and will wash sand out, during backwash.
That translates to a 1 HP pump OR LESS! I'm working on a selection chart for you, and should have a preliminary form of it ready this afternoon.
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