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Thread: FC burn rate?

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    Join Date
    Oct 2010

    FC burn rate?

    15000 gallon fiberglass michigan

    calcium 200
    TA 80
    PH 7.5
    CYA 45

    75 degrees 80% sun, what would be average ammount of FC loss by the sun for 1 day be?

    water is crystal clear btw.
    15,000 gallon inground fiberglass pool with spa. 350lb Sand filter, 1.5 hp pump, and heater

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    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    SouthWest Alabama

    Re: FC burn rate?

    We usually try to get it down to about 2 ppm FC loss per day. Somewhere close to that is normal. With a CYA of 45 and in Mi you should be close to that.

    If you're losing more than that, I'd suggest you run an OCLT to rule out organics eating it.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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

    Re: FC burn rate?

    It is only possible to give you a rough estimate, as every pool is somewhat different. I would expect you to lose 40% to 65% of your starting FC level each day.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    Swampwoman's Avatar
    Join Date
    Apr 2012
    Grand Rapids, MI

    Re: FC burn rate?

    Smooth, I'm in Michigan, and although this is my first season, I have recorded my FC each day: Generally lose between 1.5 and 2.5 per day when I'm running FC 4-6 range for 45 ppm CYA -- depending it seems, on swimmer load and sun...And whether or not one allows a guest with a dog, which will land you on the -2.5 ppm side

    Most days, even the hottest ones like that scorcher Sunday of memorial weekend, I'm not using/losing more than 2 ppm, which is 33% of the 6 ppm at which I 'ride.' But I've also added 50 ppm borates, which buffers/reduces my chlorine load, and more importantly, makes water super silky feeling to swim in!
    In ground vinyl Grecian, 24k gal, Hayward 220t sand filter, VGreen VSP 165, Hayward SWG, Raypak NG 265k heater, dolphin m4.
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