I'm using a 58498E Flowclear 1500 gallon sand filter pump that came with my 20x12x48 pool and when the pump is in the filter mode, it doesn't push out much force. You could barely feel that its on when standing in front of it, and there is no motion in the water moving from it. When I put it on circulation mode, it definitely works better, but still isn't pushing water too good. I had someone who has experience with setting up pools put it together for me, so I know it wasn't just due to my inexperience. It looks like its outputting at 10 PSI, so its not running too low or anything, I just cant figure out what's going on, and neither does the person who put it in for me. Is it possible that the wrong type of sand used in the filter can make the pool under perform like this?