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Thread: High FC Level

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    High FC Level

    Just received the T100 test kit (hooray) so now I have an accurate FC reading. Some background - have partially (70%) drained and refilled the pool twice this month due to very high CYA levels (bad advice at the pool store). Anyway, went to the BBB method with the help of this great site and pool is finally clear.

    Unfortunately, I am still very high with CYA and shock level of FC hasn't gone down as much as I thought. Based on the results below, can I swim right now? We are in S. Florida and pool is heated to 85.

    FC = 27
    CC = .5
    CYA = 90
    PH = 7.2

    12,500 IG Concrete Pebble Surface
    1 HP pump with cartridge Filter - Electric Heater
    4 Jets - Main Drain
    SW Florida

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    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Sebring, Florida

    Re: High FC Level

    Hi, Michelle,

    I would swim in your pool, others on the forum would not.

    The high CYA level in your pool really takes the "edge" (figuratively) of the harshness of chlorine. Some say to wear an old bathing suit in case of fading but I have yet to hear a report of a swimsuit faded in an outdoor pool.

    The FC should start on it's way down by about 4ppm or so daily if you are concerned. Personally, I would enjoy the pool now.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Butterfly's Avatar
    Join Date
    May 2007
    South Carolina

    Re: High FC Level

    There are a number of opinions on safe swimming FC levels and therefore not a clear cut answer.

    IMHO, I feel that anything below shock level for your CYA is okay to swim; but, other people set their line higher or lower than that.

    If it was my pool, I would go swimming!

    Now that you have a great test kit, the TF100, you can make decisions like this one! 8)
    TFP Moderator TF100 Test Kit TF100 TestKit YouTube Channel PoolMath
    You're done SLAMing when:
    1)You lose 1ppm or less FC overnight, & 2)You have .5ppm CC's or less, & 3)your water is clear.

    ~ One should not use a sledge hammer to swat a mosquito. ~

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  4. Back To Top    #4

    Re: High FC Level

    Thanks - I'll let the FC levels go down to the levels recommended based on my CYA. In the meantime, I'll enjoy the warm, CLEAR water
    12,500 IG Concrete Pebble Surface
    1 HP pump with cartridge Filter - Electric Heater
    4 Jets - Main Drain
    SW Florida

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