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Thread: SWG - muriatic acid vs dry acid

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    choitink's Avatar
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    SWG - muriatic acid vs dry acid

    Hole to be dug and pool in the ground by Friday. Likely full of water by this time next week.
    Been reading a lot about pool water care thanks to TFP.

    Question:
    Only pool store in town is suggesting that dry acid would not be a problem with a SWG, and they have never heard this could be a problem. I was planning on using muriatic acid, but seems like it would be nicer to handle the dry acid. What is the issue with dry acid and SWG?

    Thank you
    13,300G fiberglass inground pool, 16x33ft Viking Lakeshore
    Pentair IntelliFlo VS pump
    Pentair TA100 sand filter with Zeobrite
    Pentair UltraTemp heat pump, IntelliChlor SWG
    Test kit: Taylor K-2006C

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    duraleigh's Avatar
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    Re: SWG - muriatic acid vs dry acid

    There is a residual left behind with dry acid (for the life of me, I can't remember what it is) and there is literally no side effects whatsoever with muriatic.

    Once you learn a procedure for handling it, muriatic is actually quite easy to handle. In 7-8 years, I have yet to be burned or spilled any on my clothes. Twice I can remember get downwind and getting a noseful of the fumes.....I soon learned not to do that anymore.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Melt In The Sun's Avatar
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    Re: SWG - muriatic acid vs dry acid

    Sulfates are the issue, according to the manufacturers. They state that high sulfate levels, caused by adding dry acid over time, can damage the plates in an SWCG cell. As an aside, sulfate-laden water can be really destructive to concrete, mortar, etc. Even without an SWCG, I wouldn't use it in my pool. Plus, it's generally more expensive.
    11,200 gal, Pebble-Tec; Tristar 2-speed 1hp - Swimclear 325 ft2 cart - SWG - A & A in-floor cleaner - Heat pump. For the poolside cooking, a Yoder Wichita and a Big Steel Keg!
    TF Test Kits -- PoolMath -- Pool School
    Make each day your masterpiece. - John Wooden

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    choitink's Avatar
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    Re: SWG - muriatic acid vs dry acid

    Thank you. This website is great.
    13,300G fiberglass inground pool, 16x33ft Viking Lakeshore
    Pentair IntelliFlo VS pump
    Pentair TA100 sand filter with Zeobrite
    Pentair UltraTemp heat pump, IntelliChlor SWG
    Test kit: Taylor K-2006C

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    Join Date
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    Re: SWG - muriatic acid vs dry acid

    Quote Originally Posted by Melt In The Sun
    Sulfates are the issue, according to the manufacturers. They state that high sulfate levels, caused by adding dry acid over time, can damage the plates in an SWCG cell. As an aside, sulfate-laden water can be really destructive to concrete, mortar, etc. Even without an SWCG, I wouldn't use it in my pool. Plus, it's generally more expensive.
    We knew about the issues with sulfates on plaster and hardscape stone as described in Sulfates why so bad? and Sulfates - what's the problem?. However, I couldn't find anything specific on what happens with sulfates and an SWCG. Did the manufacturer say that there was specific precipitation of some chemical (and if so, what it was) or whether there was some more direct attack on the SWCG coatings by sulfate?
    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
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

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