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  1. J

    FC Test flashes red then clear after adding R-870 etc...etc

    When I opened my pool this year, I did the ritual thing to take a water sample to my usual pool dealer to have it analyzed. Up to this time I was using test strips to spot check the water balance. The guy at the store told me my cya was over 100 but the other readings (pH, FC, TA,CH) were...