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Thread: No dry acid for SWG?

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    schertzy82's Avatar
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    May 2012
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    Peoria, IL
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    No dry acid for SWG?

    I read in BBB for Beginners that dry acid should not be used with a SWG. Why is that? I don't mind switching to muriatic acid (assuming I can safely transport it in my car), but I used dry acid with my Intex Ultra Frame and Intex SWG all last season and I just reopened my pool and have been using dry acid for the last few days. Am I going to have a problem with my SWG or my pool? I'd like to use up what I have, but I suppose if I have to toss it, I will. The dry acid I used was HTH PH Decreaser from Walmart. Also, do I have to keep muriatic acid in a cool, dry place like a dry acid? Because I definitely don't want to bring liquid acid into the house; I'd rather keep it in the garage.
    Intex 18ft x 52in Ultra Frame Pool, hard plumbed w/skimmer and fountain
    Intex 4000 gph cartridge filter pump
    Intex SWG

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    Re: No dry acid for SWG?

    Aloha schertzy82!!

    Welcome to pool advice paradise!! Here is my perspective on the dry acid:

    1) No, you shouldn't throw it away...it's a bit different, but it will decrease the pH and alkalinity. (I defer to Richard the Chem Geek on the different way it treats these in comparison to Muriatic Acid).
    2) That said, there ARE some caveats to its use: Always mix it up in a bucket--don't throw it in and trust it to dissolve quickly enough to prevent damage (especially in a plaster pool!).
    3) Buy your Muriatic Acid in a case of 4 gallons, or if only 1 gallon, bring an empty 5-gallon bucket with a lid so you can protect it better in the case of an unplanned car crash.
    4) Muriatic will store just fine in your garage...maybe a good idea to dip the CAPPED bottle carefully into the pool and then place it in a bucket for storage so you don't damage anything if it leaks.
    5) Muriatic also makes a great vinaigrette if you water it down enough and use the proper olive oil...

    I hope this helps!

    Aloha!
    Warren
    Big Island Pool Service

    No pool of my own...but my customers' pools are ALL my foster babies!!

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    JasonLion's Avatar
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    Re: No dry acid for SWG?

    Using some dry acid is fine, but if you continue using dry acid for a long period the sulfate level can build up and that could damage the SWG cell (or plaster).
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    schertzy82's Avatar
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    May 2012
    Location
    Peoria, IL
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    Re: No dry acid for SWG?

    Ok, in that case I'll use up the dry acid I have left (just one bottle) and then I'll switch to muriatic acid. Thanks for the help.
    Intex 18ft x 52in Ultra Frame Pool, hard plumbed w/skimmer and fountain
    Intex 4000 gph cartridge filter pump
    Intex SWG

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