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Thread: how long should chlorine last in closed covered pool?

  1. #1

    how long should chlorine last in closed covered pool?

    I closed pool in October. When opened at the end of May I had 1-2ppm of chlorine. Is that normal? CYA 30-40. Don't know how much chlorine I had in the pool when it was closed, probably between 2-5. Pool closing kit with chlorine free shock was used right before the cover was put on.

    Thanks
    Bill
    18'X4' 7600 Gal AG
    3/4 HP Pentair Pump
    Hayward S166T 100 lb sand filter

  2. #2
    Administrator JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    34,979

    Re: how long should chlorine last in closed covered pool?

    Chlorine can last quite a while in a covered pool, though all winter is rare. If you topped up the water level before testing the chlorine could have come from the fill water.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    TFP Admin. Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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