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Thread: TA question

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    Mod Squad zea3's Avatar
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    TA question

    Hi,
    I know the pool calculator says TA levels 70-90+ are o.k., but how much is too much? Currently my PH is 7.2 and the TA is 120. Do I need to lower TA more? Vinyl liner AGP. All other numbers are in range. Thanks!
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    Re: TA question

    If your not experiencing any problems don't worry about lowering it, but I wouldn't add any more baking soda either.
    -Kevin
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    reebok's Avatar
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    Re: TA question

    lowering TA is a completely optional thing that can help slow ph rise. if it's not bothering you, I wouldn't mess with it. however if you want to add borates then you should definitely lower it. it also depends on if you use trichlor pucks. if so, you're fine at 120.
    16x32 21,000 gallon in-ground exposed aggregate, 1.5hp pump, 120 sqft catridge filter, birdcage, solar panels, aquavac tigershark qc robot.

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    Mod Squad zea3's Avatar
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    Re: TA question

    Great! I'll leave well enough alone then. Thanks!
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    Re: TA question

    If your pH is staying stable or rising very slowly then your TA is fine. If you pH is rising too fast and you have a big acid demand then your TA is too high. This is if you are using unstabilized chlorine like bleach.
    If you are using trichlor or other acidic sanitizers or using non chlorine shoch, which is also acidic,then make sure your TA is at least 100 ppm to counteract the acidity these chemicals are constantly adding. the higher TA will cause the pH to rise faster and offset the pH drop these chemical cause. Make sure the TA does not drop too low in this case or your pH will start to bounce and can crash.

    Where you put your TA depends on what you are putting in the pool. As a rule of thumb (and based on NSPI/APSP guidelines):
    Keep it low (below 100) if you are primarily using sodium hypochlorite, calcium hypochlorite, lithium hypochlorite, or a SWG.
    Keep it high (above 100) if you are using trichlor, dichlor, bromine, chlorine gas, or MPS (non chlorine shock) on a regular basis.

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