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Thread: Pool Math Question

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    Pool Math Question

    In the Suggested FC Levels section in the Pool Math Table toward the bottom, the following is shown:

    SWG:3 Normal:5 to 9 Shock:24 Mustard Algae Shock:34
    Suggested target FC levels based on the current CYA level for outdoor pools.
    Note: Be careful if your CYA is really and truly zero!

    My question is a clarifying one- Is this basically saying (in this example) that based on the numbers entered for all the other testing categories (PH, TA, CH, CYA, Salt etc...) that with a SWG, FC should be kept at 3 and normal range is considered 5 to 9 and to shock you would target 24?

    22,500 gal Lagoon shaped inground pool, vinyl liner, Hayward 4800 DE Filter, Hayward 1.5 HP super pump, Aqua Heat Pump, Nexus Pure SWG, Aquabot, Hebron, CT

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    frustratedpoolmom's Avatar
    Join Date
    May 2007
    SWSuburban Chicago, IL

    Re: Pool Math Question

    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner

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

    Re: Pool Math Question

    The SWG level is a minimum, you never want FC to go below there. Most people aim a little higher so they will have some margin in case it goes lower than expected. The normal range is for people who don't have a SWG, and again the first number is a minimum that you never want to go below.
    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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