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What is the white gritty silt in my pool? Three year old salt water in-ground pool. Pentair cartridge filter. I am finding an increasing amount of a white, gritty substance in my pool. It has the consistency of very fine sand. I used to see small amounts at the bottom of the spa below the...

3 old year salt water pool. Pentair filter and pumps. Relatively trouble free except for adding acid weekly to balance pH. Looking forward to the exchange of ideas and suggestions to keep my pool trouble free.