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Thread: Adjusting CSI

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    botanica37's Avatar
    Join Date
    Feb 2009
    Oakton, VA

    Adjusting CSI

    What is the best way to adjust the CSI? I can raise either the PH to 7.8 or the TA from 80 to 90 and the CH from 280 to 350 to get the CSI to say balanced. My current results:

    FC 16 (still shocking the pool, though the PH has been stable for the past 4 days despite the 12+jugs of chlorine)
    PH 7.5
    TA 80
    CH 280
    CYA 50 ( after almost 2 seasons and countless drainings/refills)
    CSI -0.32 (potential to become corrosive to plaster)

    Thank you!
    free form 40k gal, IG, plaster, Triton II 100C sand filter, Lite 2 heater
    1 1/2 HP Pentair Ultra Flow High Performance pump
    Caretaker in-floor cleaning system

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    In the Industry

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

    Re: Adjusting CSI

    High FC levels and give the PH a false reading. I wouldn't do any adjusting until the FC drops below 10. When it does, retest the PH. You may find yourself having to adjust the PH in addition to the TA.

    Congrats on bringing the CYA into range.
    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
    Perfectly Clear Pool Service, Find me on Facebook!

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

    Re: Adjusting CSI

    Two points. First, you actually want CSI to be a little negative, PH tends to go up and heaters and SWG have higher CSI internally. Second, it really isn't worth trying to balance your CSI to any exact number. All of the numbers will vary over time, especially PH. Trying to micro manage your levels uses to many chemicals.
    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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