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Thread: Overnight FC Test

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    Overnight FC Test

    For the purposes of the Overnight FC Loss Test, does a cloudy day (no appearance of the sun) work as well as a night? In other words, can I essentially do the test in the day instead of night if it's cloudy outside?


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

    Re: Overnight FC Test

    No, even heavy overcast still causes some chlorine loss due to "sunlight".
    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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    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    SouthWest Alabama

    Re: Overnight FC Test

    Just like you can sunburn on a cloudy day, the sun will still burn off some FC.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
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