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Thread: WOW FC Dropped

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    Join Date
    Mar 2011
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    Houston, TX
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    WOW FC Dropped

    Yesterday FC was 5.5. Removed the tabs from the chlorinator and checked this evening and I was down to 3. Just added 269 oz of bleach to bring it up to 10. I have a high CYA of over 100 so I am maintaining a high FC until I can replace water.
    18,500 gallons, Cartridge Filter, In Ground Plaster. Jandy CL460 Filter

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    JasonLion's Avatar
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    May 2007
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    Silver Spring, MD
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    Re: WOW FC Dropped

    With CYA over 100, you never want to let FC fall below 10. Letting FC go lower risks algae, and once you get algae it will be exceptionally difficult to get rid of unless your bring CYA down.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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  3. Back To Top    #3

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    Re: WOW FC Dropped

    how long should I wait to retest?
    18,500 gallons, Cartridge Filter, In Ground Plaster. Jandy CL460 Filter

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    Butterfly's Avatar
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    May 2007
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    South Carolina
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    Re: WOW FC Dropped

    Quote Originally Posted by brownchristian
    how long should I wait to retest?
    About an hour, with pump running.
    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.

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  5. Back To Top    #5

    Join Date
    Mar 2011
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    Re: WOW FC Dropped

    Retested and I am at 12 now. Water looks great. Wish there was an easier way to lower CYA cause its almost a sin it to remove this water.
    18,500 gallons, Cartridge Filter, In Ground Plaster. Jandy CL460 Filter

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