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Thread: FC level vs PPM on bleach bottle

  1. Back To Top    #1

    Join Date
    Aug 2014
    Litchfield, CT

    FC level vs PPM on bleach bottle

    Can someone explain the different between the FC level and the warning on the bottle of bleach to not swim if bleach if more than 3ppm?

    I am keeping my FC level at the recommend level and have not had any issues, but my husband is concerned with the bleach label stating that we should not swim if the bleach is higher than 3ppm.

    Thank you.
    Accounting MaMa

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    Defgufman's Avatar
    Join Date
    Mar 2015
    Savannah GA

    Re: FC level vs PPM on bleach bottle

    The container does not take into consideration the amount of CYA that is in a pool. The higher the cya the more fc you need to sanitize your water as some is locked up by cya itself.
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  3. Back To Top    #3
    Richard320's Avatar
    Join Date
    Jan 2010
    San Dimas, CA (LA County)

    Re: FC level vs PPM on bleach bottle

    The 3 ppm is for water with no CYA in it. The active actual OCL- concentration is lower with some stabilizer (CYA). 2 FC with no stabilizer will bleach swimsuits rather quickly. But I've swam in water with 20 FC and 200 CYA withe no problem, eyes open underwater even.

    This scholarly thread has some graphs. Note the graduations are logaritmic. Pool Water Chemistry
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