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Thread: Expected Free Chlorine Loss

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    Expected Free Chlorine Loss

    I live in South Arkansas and we're getting 85-92 degree sunny days right now. My 17,500 gallon fiberglass pool has a CYA of 50. What is a reasonable daily FC loss? I'm losing around 3ppm a day and that seems excessive to me. What do you think?


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    dmanb2b's Avatar
    Join Date
    Apr 2009

    Re: Expected Free Chlorine Loss

    Not out of norm. Do you continue to pass the overnight FC loss Test?
    24'x52" AGP (13,500 Gallons), Intex SWG, (2)Solar Bear 4x20 panels, Hayward S220T Filter, 1/2hp Pentair Superflo

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    Join Date
    Feb 2008
    Flower Mound, TX

    Re: Expected Free Chlorine Loss

    Lots of heat, sunlight, and organics would account for that amount of loss. Like dmanb2b mentioned, you want to make sure that you pass the overnight FC loss test just to be sure there isn't anything lingering in there.
    10K gallon IG gunite with waterfall; Pentair CC320P filter; WhisperFlo 2 HP pump
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    duraleigh's Avatar
    Join Date
    Apr 2007
    Sebring, Florida

    Re: Expected Free Chlorine Loss

    Yep, pretty normal.
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
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