I just put an Intex sand filter om my pool a few days ago and after running it awhile during SLAM I'd go out and find my pressure gauge had risen some and flow had slowed way down to almost nothing so I'd backwash and all would be normal again. It just seemed like I was having to backwash a lot. Now I'm noticing that when I go out there and find my gauge up and the flow diminished way down, that I can turn the pump off and not do anything but wait a minute or two and then when I turn it on again, flow seems normal..... What gives?