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Thread: Muriatic Acid- how much can I add at one time?

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    Join Date
    Nov 2014
    Palm Desert, CA

    Muriatic Acid- how much can I add at one time?

    How much muriatic acid can be added at one time? We have only been adding 16oz at a time then waiting four hours, retesting and adding the balance if still needed. Is it ok to add 32oz at one time? We use the dilution method and add it to the deep end of the pool in front of a return. Thanks!
    17,000 gallon inground pool; Plaster redone January 2015; Pentair Cartridge Filter; SWG; Age of pool unknown (house built in 1973); Taylor K-2006 Test Kit.; Doheny Discovery robot cleaner.

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    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Tucson, AZ

    Re: Muriatic Acid- how much can I add at one time?

    Add as much as you need to achieve the desired result.

    No need to dilute it (that is just more handling). Just slowly pour it in front of a return jet in the deep end (pencil size stream). If you sit and kind of float the bottle in the water, you can pour the acid only a few inches and avoid splashing.

    Should be able to retest and get an accurate result within an hour.
    Jason, TFP Moderator
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    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: Muriatic Acid- how much can I add at one time?

    Use PoolMath to calculate how much you need. If you are making a large PH change (0.5 or more) then add two thirds of what it says, otherwise go ahead and add all of what it says.

    Remember that you need to enter your current TA and Borate levels for PoolMath to calculate PH changes correctly. If you don't know what Borate is, you can assume it is zero.
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