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Thread: Very low alkalinity

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    Very low alkalinity

    Just had the pool store analysis of pool water.
    Temp 72
    CYA 100
    Tot Chlorine 10
    Free Chlorine 9.3
    ph 7.4
    Tot Alkalinity 67
    Adj Tot Alk 37
    Tot Hardness 232

    Alk is a little low so I added Baking Soda to raise up. Am I correct?

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

    Re: Very low alkalinity

    Welcome to TFP!

    Yes, baking soda will raise TA.

    If you are using trichlor tablets, your TA is very low and should be raised to around 120-150. But if you have a SWG or are using liquid chlorine/bleach you don't want to raise TA very much at all.

    I see that your CYA level is very high. CYA at 100 is not good, especially since most of the common CYA tests will report any level over 100 as if it was 100. You really want to bring CYA down much lower by replacing water.
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