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    Black dust coming out of sand filter/salt pool, 25,000 gallon inground, vinyl liner

    Took 3 weeks to get crystal clear H20 after pool was opened 7/3; drained almost half of H20. Pool sand was replaced August 2019; ph, alkalinity, FC all ok, stabilizer slightly high, hardness slightly low, no TC measuring. Water crystal clear. No sediment on floor when pump/filter are off but...