I have a 20ft round, 4ft deep above ground pool and for the last 2 summers I can't seem to keep it clean and clear. I get my water checked weekly and run my filter non-stop but still no clear water.
I'm thinking that my sand filter is too small and can't keep up. How big should my sand filter and pump be for what I'm using?
My preference for filters is a two speed pump, about a 3/4 and 1 1/2 HP connected to a sand filter. While a horse and a half pump is commonly used with a two return system for constant filtering a smaller HP will actually do a better job. The higher HP works better for vacuuming and other maintenance, which is why I prefer a two speed system.
I have written a few pages about filter systems and pool maintenance you might find interesting also.