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Thread: PH down vs. muriatic acic

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    PH down vs. muriatic acic

    Is there any difference between the dry acid, commonly found in PH- and the liquid muriatic acid? Is one better than the other for lowering PH and TA? Thanks.
    16 X 32 Vinyl. Hayward aqua rite salt system, T -15 cell. Hayward H250 gas heater, Hayward 1HP superpump.

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    Join Date
    May 2009
    Jasper, TN

    Re: PH down vs. muriatic acic

    liquid muriatic acid is cheaper

    Since it's a liquid it incorporates almost instantly in the water where as the dry stuff can settle and some have fear cause damage while it's dissolving.

    liquid muriatic acid is also usually easier to find at most hardware stores.
    24' x 52" AGP = 13.5k gallons
    Dynamo 2.0 HP pump,Sand Dollar sand filter
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    Join Date
    Jan 2009
    Cupertino, CA

    Re: PH down vs. muriatic acic

    On the other hand, muriatic is nastier if you spill it. But for the most part dry acid is worthwhile only for small pools and spas, because in those pools you would need pretty tiny amounts of muriatic.
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    IG plaster pool 18.5K gal, Hayward Pro-Grid DE filter, 3/4 HP Hydramax II; Polaris 380, 3/4 HP booster
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    Join Date
    Mar 2007
    San Rafael, CA USA

    Re: PH down vs. muriatic acic

    Also, the dry acid (sodium bisulfate), or pH Down or pH Minus, increases sulfates in the water. With Muriatic Acid, one increases chloride levels, or plain salt. There might be some issues if sulfate levels get high, but we don't have enough experience to know at what level things become a real problem (the problems are more theoretical such as very high salt recrystallization with magnesium sulfate that could damage stone and a lowering of the saturation index as well).
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
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