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Thread: Raise TA without raising PH

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    Raise TA without raising PH

    How do I raise the TA in my hot tub without raising the PH?
    21,000 gal AG 30 foot round pool. Sand Filter. 1.5 hp pump.
    360 gallon 2015 relay hot springs hot tub
    North Dakota

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    Patrick_B's Avatar
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    Re: Raise TA without raising PH

    You can use baking Soda. It has the least effect on pH when raising TA. The lower your pH is however, the greater the chance you will see on it with Baking Soda.
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    Mod Squad JohnT's Avatar
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    Re: Raise TA without raising PH

    Add baking soda. Why do you want raise TA if you don't need the pH raised?
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    Re: Raise TA without raising PH

    Quote Originally Posted by JohnT View Post
    Add baking soda. Why do you want raise TA if you don't need the pH raised?
    I can get the Ph down to 7.6 but then the TA goes down to 40. Is that too low TA?
    21,000 gal AG 30 foot round pool. Sand Filter. 1.5 hp pump.
    360 gallon 2015 relay hot springs hot tub
    North Dakota

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    Re: Raise TA without raising PH

    No, that is not too low assuming your spa/hot-tub is not plaster and does not have tile with grout exposed to the water (most hot tubs are acrylic so saturation of the water with calcium carbonate is not needed).

    For additional pH buffering we suggest using 50 ppm borates, most easily added by getting boric acid from Duda Diesel or The Chemistry Store. Did you read the sticky on How do I use Chlorine in my Spa (or pool)? assuming you are using chlorine (there's a separate sticky if you are using bromine).
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    Re: Raise TA without raising PH

    Thanks. I left it along and I will check into borates. I found the chlorine post very very helpful. The frustrating part is the test strips don't agree with each other. I did get the Taylor test kit and those readings are so different than the test strips too
    21,000 gal AG 30 foot round pool. Sand Filter. 1.5 hp pump.
    360 gallon 2015 relay hot springs hot tub
    North Dakota

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    Re: Raise TA without raising PH

    Trust the Taylor results.
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    Mod Squad pooldv's Avatar
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    Re: Raise TA without raising PH

    I use bleach in my tub and adding borates made a big difference. Our tub water is very nice with bleach, borax, cya and a little epsom salt.
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