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  1. B

    Chem problems

    Pool: outdoor 15000 gal Pebble tech (2002) gunnite Jandy HE2 heater (380,000btu) Intelliflo pump Cartridge filter system (4 filters) cleaned regularly Pool temp kept 90 degrees Pool used daily - one to two people Water is sparkling clear Oto test kit plus TFP test kit Ph7.4 FC 3 to 12ppm TA...