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Thread: TA too low

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    TA too low

    pH 7.2
    TA 50
    CH 775
    CYA 60
    TC 6

    In SoCal, calcium hardness is my troublespot. 775 is after emptying half the pool during spring (and now it's too hot out here to bother again until fall...), so I try to keep my pH at 7.2 to keep my hardness from going up. In the process, my TA has started going down consistently and not rising at all.

    Any suggestions? What is the lowest I can keep my TA?


    13,000 gallon plaster salt water pool. Jandy DEV60 filter, Jandy AquaPure SWG (APURE1400)

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

    Re: TA too low

    In most cases you don't want TA below about 60.

    Acid additions, to keep the PH under control, are what is lowering TA. Acid always lowers both PH and TA.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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  3. Back To Top    #3

    Re: TA too low

    Yeah, exactly- so I was just wondering if there was a better way to avoid my TA going so low (add less acid more times per day?).

    13,000 gallon plaster salt water pool. Jandy DEV60 filter, Jandy AquaPure SWG (APURE1400)

  4. Back To Top    #4

    Re: TA too low

    I don't usually recommend using the CSI for most people because it is usually not necessary and creates unnecessary complication. However, with your situation, I would recommend using the CSI to make sure that your water is not oversaturated or undersaturated. As long as the CSI is about -0.3 to about +0.3, you should be fine.
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  5. Back To Top    #5
    Richard320's Avatar
    Join Date
    Jan 2010
    San Dimas, CA (LA County)

    Re: TA too low

    My TA sits around 60-70 and my CH is about the same. Do you use a speedstir to run the CH test? When I went from manual swirling to the speedstir, my CH results dropped a couple hundred ppm. It can mix the water way better than you can and its wrist doesn't get tired.

    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
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