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Thread: High TA and high CH

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    wmwinn's Avatar
    Join Date
    Jul 2012
    Location
    Albuquerque, NM
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    27

    High TA and high CH

    Just received my TF-100 test kit in the mail, here are my first "real" results:

    FC: 6.5
    CC: 0.5
    TC: 7
    CYA: 38
    PH: 7.2
    CH: 460
    TA: 160

    My pool comes from well water, yes it is known to be hard. Also, since I have an automatic pool cover, the water only sees the sun maybe 1% of the time... is CYA level very important to me?

    I was a bit disappointed in the CC level of 0.5, I'd like to see that go away.

    I'm 10 days past a Clorox shock, where the water cleared up SIGNIFICANTLY! Yay! FC has stayed above 5 the entire time since shocking at 12ppm for 5 days.

    Based on reading other posts, maybe I should aerate to raise pH, then knock it back down with MA - trying to lower the TA. Other suggestions?

    - Mark -
    Inground gunite 34x28 sport pool (24,300 gal)
    Hayward T-Cell-15 SWG, Solar heating
    Hayward sand filter, automatic cover
    Muriatic acid injection using fish tank peristaltic pump

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    Join Date
    Jul 2009
    Location
    Olney, MD
    Posts
    218

    Re: High TA and high CH

    The sunlight would burn off your CC, given that your pool only sees 1%, that makes sense. You shouldn't experience very much chlorine loss at all if you keep the pool covered that much, unless you have a super high bather load during the 1%. Yes, the correct way to reduce TA is to add MA to reduce pH to 7.2 then aerate back up to 7.8 then MA back down to 7.2, until you get your TA to a number that you can live with.
    20k gal, IG Vinyl, IntelliFlo VF Pump, 60 GPM sand filter, Jandy Aquapure Ei 35, 2 skimmers, one main drain, two returns, Dolphin Diagnostic cleaning robot, Taylor K-2006 test kit

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    JasonLion's Avatar
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    May 2007
    Location
    Silver Spring, MD
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    37,879

    Re: High TA and high CH

    Leaving the cover on tends to drive up the CC level. If CC is being a problem you should leave the cover open more often.

    There is a great article on lowering TA in Pool School, though you already described the basic idea perfectly.
    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

  4. Back To Top    #4
    wmwinn's Avatar
    Join Date
    Jul 2012
    Location
    Albuquerque, NM
    Posts
    27

    Re: High TA and high CH

    Thanks for the info!
    Inground gunite 34x28 sport pool (24,300 gal)
    Hayward T-Cell-15 SWG, Solar heating
    Hayward sand filter, automatic cover
    Muriatic acid injection using fish tank peristaltic pump

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