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Thread: Is this normal

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    Is this normal

    I just installed a new SWG. At night after the pump shuts off, I test the FC and its around .5

    I test in the morning after the pump comes on and the FC is around 3.......How does it go up overnight???
    17,200 in ground Vinyl pool......
    Salt Water
    Sand Filter

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    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Sebring, Florida

    Re: Is this normal

    It doesn't, unless you have some other source of chlorine in the pool (floater, etc.)

    What test (OTO, DPD, FAS/DPD) are you using? A testing error is the most likely suspect.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: Is this normal

    Is there any chance that the pump is programmed to run for a while in the middle of the night?
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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