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Thread: Maintaining FC on High Swim Days

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    First Pool Judith's Avatar
    Join Date
    Feb 2014
    Georgetown, Texas

    Maintaining FC on High Swim Days

    FC 3.6
    CYA 40
    TA 80
    PH 7.4-7.6
    Finally getting the hang of this.

    I read that if you know you're going to have a heavy swim day/pool party you should raise up your FC ahead of time in preparation for this. Is there a recommended chart of how much I should raise the FC to? Does it matter if it's 5 people or 15? Thanks for the recommendation!
    Judith and Brian D
    16,000 gal; IG Quartscape; Cartridge Jandy CV460 (150 gpm Max); Jandy Pro 2.0 Variable
    Polaris PB460 3/4 booster; Polaris 280 Cleaner; In Line Chlorinator Tri-Chlor (don't use it) Ozonator
    Fill Date 11/11/2013

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

    Re: Maintaining FC on High Swim Days

    For 5 people, I wouldn't worry about it. But for 10+ people you want to raise the FC level up to the very high end of the normal range, and for 30+ people raise to just below shock level. The numbers are approximate, the exact number isn't critical. For numbers of people in-between those two, you can pick FC levels in-between the suggestions.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    BoDarville's Avatar
    Join Date
    Jun 2012
    DFW, Texas

    Re: Maintaining FC on High Swim Days

    Welcome to TFP!

    Well, Jason beat me to posting as I was typing, but I think we are essentially saying the same thing...

    At a CYA level of 40 ppm, your target FC level is 5 ppm. I would hold it there if you're looking at a bather load of 5 or so. If you will have 10-15 bathers, then I would raise it up to between 6-7 ppm just prior to your pool party. After the party, I would retest FC and make sure that it is at least at your target level of 5 ppm. Remember, some of the FC loss will be due to sunlight and not just the increased bather load. If you had 10+ bathers and wanted to hold FC at 6-7 ppm overnight for a little extra insurance, there's no harm in doing so. Remember to give your filter some extra run time after the party as the water may be a little more hazy than normal due to oils, tanning lotions, etc.
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    Join Date
    Mar 2007
    San Rafael, CA USA

    Re: Maintaining FC on High Swim Days

    Every person-hour in your 16,000 gallon pool would need around 0.066 ppm FC so 10 people in the pool for an hour would only be a chlorine demand of around 0.7 ppm. Of course, if the people urinate, that's a whole other matter.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
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    Casey's Avatar
    Join Date
    Apr 2007
    SW PA

    Re: Maintaining FC on High Swim Days

    Someone ALWAYS wee wees in the pool.
    I'd bet you my bikini you'll never get TFP water from a pool store!

    24' Sharkline Venture De Filter

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    jcowart's Avatar
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    Jun 2012
    Labelle, TX

    Re: Maintaining FC on High Swim Days

    I have a posted rule that asks for the "P" to stay out of our ool.
    17500 gallon Doughboy AGP, Hayward DE filter, waiting for the 1.5hp DB pump to go out.
    Learn to take the advice here and be trouble free or use the pool store's advice. "You can't do both and get very far"

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    Patrick_B's Avatar
    Join Date
    Jun 2011
    Midland TX

    Re: Maintaining FC on High Swim Days

    Quote Originally Posted by Casey View Post
    Someone ALWAYS wee wees in the pool.

    Count on it, someone will. I will be dosing for me.
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