We are considering replacing our 6 yr old sand filter with a DE filter because there is a lot of excavation going on behind our house. We have been having a very difficult time keeping our pool clear. We do not have an automatic cover (and we really can't afford one.) We currently have a 1Hp pump (SF=1.25) - came as part of the Pentair SuperFlo pump. The pump has 2" connections. We have 2 - 1 1/2" return lines, 1 - 1 1/2 skimmer line, and 1 - 2" floor drain line. We also have a 5 ton Heat Siphon heat pump. We are looking for a filter with ease of use that will keep the pool clear (the sand filter just doesn't seem to be doing a good job.- especially if we get any algae or dust). We just replaced the sand 2 years ago (bought sand at Leslies). Currently we are clearing up an algae issue, and yesterday I put skimmers socks over the returns (with gum bands) Any suggestions about socks on returns...?? . Anyway, to my main question, we are looking at the Pentair Quad DE 60, but I think it might be too big. According to my calculations we should need a 36 sq. ft. filter media. Will my current pump setup be able to adequately backwash the Quad 60? Any other suggestions are welcome.