ok thank you so much for all your help in my previous posts! I can get the larger sand filters for $36 (250lb) more and $46 (300lb) more so I am very willing to do that. I got info overload from reading on here and somehow got it in my head that running the pump on low might be too "weak" to push it thru a bigger sand filter.......and the whole point in getting a 2 speed was so that I could mainly use it on low.I don't think I ever fully understood how it all works but I was very aware that the 1.5hp was way to big. My husband is a plumber so I should be able to get him to replumb all that like you said. So this 300lb sand filter will hook up to the above pump just fine even though it says its for in-ground pools?

http://www.amazon.com/Hayward-S244T-...27+sand+filter