I have the SD80 on my 14,000 Gal IG pool mated with a pentair 1.5 Hp superflo. So far so good. It hangs around 16 PSI all summer. its a big filter that could have gone the entire summer season with maybe 1 backwash... now granted we dont have any tree/leaf problem and minimum to light medium bather load, but so far we are happy.