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Thread: TA effect on pH

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    apoteker's Avatar
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    TA effect on pH

    I have a 31500 gallon vinyl liner pool and it seems as if I have to constantly add acid daily to keep my pH at around 7.5. My TA has been running at between 80 and 90. Here are my test results from this evening:

    FC 5.0
    CC 0.5
    pH 7.8
    TA 80
    CYA 35

    Is 80 an acceptable TA for my pool or should I attempt to raise it? Also, is it normal to have to adjust pH on a daily basis? Thanks in advance for replies!

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    JasonLion's Avatar
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    Re: TA effect on pH

    If your PH is constantly going up, you should let TA god down to 60. Higher TA levels mean more PH drift. Second, don't try to keep PH down at 7.5. Maintain PH closer to 7.7 to 7.8. Lower PH levels mean more PH drift.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    Richard320's Avatar
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    Re: TA effect on pH

    80 TA is fine.

    Do you have hard water where you live? A lot of evaporation or splashout?

    Daily acid seems extreme once the TA gets down to double digits, unless you're constantly adding more TA via refills.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
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    apoteker's Avatar
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    Re: TA effect on pH


    No, my CA was 60 during my last test and I only have to add water about once per week. So I should let my pH stay higher than 7.5? I've tried to keep it around the middle of the suggested target levels.

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    Mod Squad JohnT's Avatar
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    Re: TA effect on pH

    Do you have a SWCG?
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

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    apoteker's Avatar
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    Re: TA effect on pH

    No SWG. I just add 12.5% liquid chlorine as needed.
    Quote Originally Posted by JohnT View Post
    Do you have a SWCG?

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