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Thread: Where is my muriatic acid going

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    Where is my muriatic acid going

    I am a new pool owner and I am trying to learn about a SWG system. My PH goes up about .2 each day. I am having to add muriatic acid about twice a week to keep it in range. What is happening to the acid?




    32,000 gallon plaster pool with spa. SWG

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    JasonLion's Avatar
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    Re: Where is my muriatic acid going

    It is effectively turning into water.

    You should lower your TA level to reduce the amount of PH drift you are experiencing. We recommend TA around 60 to 70 with a SWG.

    High TA is just like soda water, it effectively raises the dissolved CO2 level. The SWG causes aeration, with allows CO2 to escape. Since CO2 is an acid, that raises the PH.
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    ranger_ric's Avatar
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    Re: Where is my muriatic acid going

    Awesome Answer Jason..... Now, after 2 months of reading about this, I understand..

    Thanks
    Last edited by ranger_ric; 07-16-2014 at 09:16 PM. Reason: grammar
    17500 Gal Above Ground, 1.5HP Dynamo Pump, 250# Pentair Sand filter with ZeoLite. Diver Dave Cleaner. TFP test kit w/SpeedStir, 7 Grandaughters and 1 Grandson swimming every week WooooHooo!!

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    Re: Where is my muriatic acid going

    Thanks. Good explanation. My TA is currently 80. How do you lower the TA? Do they make a system that can add a acid drip into the pool like a chlorinator?

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    Re: Where is my muriatic acid going

    When you add acid to lower the ph it also lowers the TA... aeration brings back up the ph but the TA stays at it's lower point. Doing this over time will lower your TA to where your ph shift is less and more manageable.
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    Re: Where is my muriatic acid going

    Quote Originally Posted by JasonLion View Post
    It is effectively turning into water.

    You should lower your TA level to reduce the amount of PH drift you are experiencing. We recommend PH around 60 to 70 with a SWG.

    High TA is just like soda water, it effectively raises the dissolved CO2 level. The SWG causes aeration, with allows CO2 to escape. Since CO2 is an acid, that raises the PH.

    Jason, that is the post of the year!!

    I would love an elaborated "Pool School" that explains the WHY behind all of these recommendations, not just "TA of 60-80 for salt (THIS IS IMPORTANT)". Inquiring minds REALLY DO want to know WHY it is important!
    Those of us who are bad with cookbook recommendations can start to understand how getting lazy on a particular element is harming us.

    Loved it, want more of it.
    19k gal, STS1072R A.O. Smith C-Face Motor .75HP Full-Rated 2-Speed, Hayward Sand Filter

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    JasonLion's Avatar
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    Re: Where is my muriatic acid going

    LotusRacerX, the "why" information is around, but not nearly as well organized as the material in Pool School. A good place to start for "why" information is the Further Reading article in the Miscellaneous section of Pool School. Keep in mind that the "whys" tend to be a lot more complex and take more background to figure out.
    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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