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    Constant excessive PH rise - Plaster Pool

    Saltwater pool 30,000 gallons elevated hottub approx 1500 gallons?? Built Spring 2019 (6th year) Mid dark plaster Basic problem: PH keeps rising even when water is not circulating. Did a test yesterday, PH around 5PM was 6.8. This morning at 5AM the PH was 7.2. The pump was not running...