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I took the quad de filter apart yesterday cleaned the cartridges with the hose and put it back together added de and the pressure showed 10 or 15. Today I took it apart cleaned it. (In process of fighting algae) the pressure was about 35 when I shut it off to clean it. Then when I turned the...

I am trying to get a 13,000 gallon in ground pool cleared up. It has not been clear in about two years. It has been shocked a couple times during that time but never cleared up. It has a pentair quad de 60 filter and jets in the bottom of the pool for returns. It is mostly blue but really...