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Thread: muriatic vs. sulfuric

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    muriatic vs. sulfuric

    Pool store guy said if your pH and Alkalinity are both high you would use muriatic to bring them down. If only pH is high you use sulfuric, as it has little impact on Alkalinity. Any thoughts?
    8 K pool, cc 100 filter, Auto-Pilot SWG, 1 HP Whisper-Flo pump, in-ground gunite pool 9 yrs. old,solar heat and Pentair 250K heater.

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    Mod Squad JohnT's Avatar
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    Re: muriatic vs. sulfuric

    He's wrong. Lowering the pH of the water changes the form of some of the carbonate in the water to carbon dioxide, which reduces the measured alkalinity and makes it possible to remove it from the water by aeration. It doesn't have any permanent effect on the alkalinity unless you aerate the water to remove the CO2The alkalinity doesn't care how the pH got lower.

    Muriatic acid contains hydrogen and chlorine, both of which are normal in a pool. H2SO4 leaves sulfur behind.
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    Re: muriatic vs. sulfuric

    Quote Originally Posted by JohnT
    Muriatic acid contains hydrogen and chlorine, both of which are normal in a pool. H2SO4 leaves sulfur behind.
    Just for clarity, the "chlorine" in Muriatic Acid is chloride - that is part of salt. The dry acid leaves sulfates behind.
    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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