I just recently replaced my pool for a larger one. Ben and I were discussing sand filters and his preference is either a Pentair or Hayward. With 20K, you would probably want a 24" filter. Here are the links he sent to me. See if either one of these would work for your pool.

http://www.a1poolparts.com/-strse-14...ass/Detail.bok

http://www.a1poolparts.com/-strse-14...ide/Detail.bok

Your pump is pretty big. You really don't need such a big pump. When it comes to pool pumps, bigger is not better. A too powerful pump can force debris too quickly through a filter without filtering it out. It can also cause damage to the filter.

Someone else may chime in here on this thread with more opinions on this. I am not the equipment guru by any means, but this may at least give you a start.

Welcome to the Pool Forum by the way!