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Thread: Downsides of high FC

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    jefeyessica's Avatar
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    Downsides of high FC

    What, if any, are the downsides of keeping a high FC?

    For example, with my CYA, the pool calculator suggest a FC range between 4.0-8.0. Would there be any disadvantages to bringing it up to 10 or 11 at night? That way, when my pool uses 3ppm, it will go down to 7 or 8 by the following night. I like the idea of doing this, because it protects my FC from going too low by nighttime.
    14,200 gallon in ground Plaster Pool
    "Titan Vertical Grid Filter" -- Pressure DE, 60 sq ft filter area

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    dmanb2b's Avatar
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    Re: Downsides of high FC

    shouldn't be a problem...I would split the difference...target 9ppm and you'll end up at 6ppm in the evening...you'll still be 2ppm above your minimum
    24'x52" AGP (13,500 Gallons), Intex SWG, (2)Solar Bear 4x20 panels, Hayward S220T Filter, 1/2hp Pentair Superflo

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    JasonLion's Avatar
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    Re: Downsides of high FC

    The only significant down side is that you will use more chlorine that way.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    jefeyessica's Avatar
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    Re: Downsides of high FC

    How do you use more chlorine that way? Doesn't it still burn off at the same rate?
    14,200 gallon in ground Plaster Pool
    "Titan Vertical Grid Filter" -- Pressure DE, 60 sq ft filter area

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    JasonLion's Avatar
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    Re: Downsides of high FC

    The amount of chlorine used up by sunlight is a percentage of your starting level. A higher starting level means more chlorine used by sunlight. Chlorine used keeping the pool sanitary will be the same either way.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    jefeyessica's Avatar
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    Re: Downsides of high FC

    Really? Interesting. I wonder why it's a percentage, instead of a set number... Any chemical reasons for that?
    14,200 gallon in ground Plaster Pool
    "Titan Vertical Grid Filter" -- Pressure DE, 60 sq ft filter area

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    dmanb2b's Avatar
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    Re: Downsides of high FC

    Let me see if I can try to explain (hope my thinking is right here) sunlight burns the chlorine at a certain rate...the more chlorine you have in the pool as a percentage of your pool water the more chlorine you will burn.
    24'x52" AGP (13,500 Gallons), Intex SWG, (2)Solar Bear 4x20 panels, Hayward S220T Filter, 1/2hp Pentair Superflo

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    JasonLion's Avatar
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    Re: Downsides of high FC

    To add to what dmanb2b said, all of the chlorine is exposed to sunlight. If there is more chlorine then more chlorine is exposed to sunlight. Chlorine breaks down at some rate when exposed to sunlight (the rate depends on the CYA level and the intensity of the sunlight). All of the chlorine will be breaking down at the same rate, so more chlorine means more of it breaks down.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    jefeyessica's Avatar
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    Re: Downsides of high FC

    thanks for the clarification!
    14,200 gallon in ground Plaster Pool
    "Titan Vertical Grid Filter" -- Pressure DE, 60 sq ft filter area

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