Hi, Phil,

Filter size is probably the single most important element. You should be able to find a gpm rating for that filter on the man. web site. Take that rating, say it's 70 gpm, and look for a pump with a curve that will push about 50-60gpm through the filter. In other words, size your pump so it's somewhat smaller than the filter's capacity.

Find the pump curve, again, on the man. web site. To interpret the pump curve, you'll need to know tdh (head). For most pools that don't have anything extraordinary, 50 seems pretty close for head.

To my knowledge, salt has nothing to do with your pump size.