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Thread: FC Levels

  1. Back To Top    #1

    Join Date
    Jun 2014
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    Queenstown, MD
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    FC Levels

    I generally test water and add liquid bleach in the mornings. Several times a week, FC will register at 1 to 1.5. I add enough chlorine to shoot for FC=4. Should I be adding more bleach to keep the FC level at or above 2?

    pH=7.6
    TA=80
    CH=40
    10000 IG plaster pool / Pentair Clean & Clear Plus 420 sqqft cartridge filter / Aqua Rite SWG T-15/ Taylor K-2006 Test Kit

  2. Back To Top    #2

    Join Date
    May 2013
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    Bay City, Michigan
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    Re: FC Levels

    Your FC level is entirely dependent on your CYA level, which i don't see listed.

    http://www.troublefreepool.com/conte...ater-chemistry
    CYA - Cyanuric Acid - Protects chlorine from sunlight and determines the required FC level. (outdoors 30 to 50, SWG 70 to 80, indoors 0 to 20)
    Chlorine/CYA chart - http://www.troublefreepool.com/conte...art-slam-shock
    12500 gallons, 24 foot round above ground
    Hayward Sand filter, Pentair OptiFlo 1HP 2-Speed pump

  3. Back To Top    #3

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    Re: FC Levels

    Depends on your CYA, you might need a higher minimum FC.

  4. Back To Top    #4

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    Re: FC Levels

    Yes, forgot to add CYA=30
    10000 IG plaster pool / Pentair Clean & Clear Plus 420 sqqft cartridge filter / Aqua Rite SWG T-15/ Taylor K-2006 Test Kit

  5. Back To Top    #5

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    Re: FC Levels

    Yes, with 30 CYA, your minimum is 2. You either need to add more often, (many do daily) or increase your amount so it does not fall below 2 by the next time you add more chlorine
    12500 gallons, 24 foot round above ground
    Hayward Sand filter, Pentair OptiFlo 1HP 2-Speed pump

  6. Back To Top    #6

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    Jun 2014
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    Re: FC Levels

    Got it, thank you for confirming.
    10000 IG plaster pool / Pentair Clean & Clear Plus 420 sqqft cartridge filter / Aqua Rite SWG T-15/ Taylor K-2006 Test Kit

  7. Back To Top    #7

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    Kiss4aFrog's Avatar
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    Re: FC Levels

    You should try to maintain 4 at all times and not drop below 2 to keep from having a problem. If you can't test and adjust daily you might want to go a bit over 4 so you stay above that 2. If you record your tests for a week or two you can see what it takes to keep it in the proper range.
    '70s IG Vinyl 32K gal, Lazy L, Hayward SuperPump 1.5hp 120V, S240 Sand Filter W/DE
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