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Thread: Muriatic acid vs. dry acid

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    guamguy's Avatar
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    Muriatic acid vs. dry acid

    I've read that using dry acid can harm SWG cells somehow. I've installed an Intex SWG on my pool, and sometimes it's tough to find MA in my area. Home depot always has dry acid available, and the pool store sometimes has MA, but not very often. What are the risks of using dry acid, and how could I mitigate them? If it just means more frequent cleaning of the cell, then so be it. It's been about a week and so far, my pH has been stable at 7.5, but I've been using dry acid for most of the time I've had the pool.
    My current test results:
    FC=5
    CC=0
    pH=7.5
    TA=60
    CH=300
    CYA=50
    12,800 gallon IG plaster kidney-shaped pool, waterslide, 800 gallon spa.
    1HP 2 speed Sta-Rite pool pump, 1.5 HP Sta-Rite spa jet pump. 2 skimmers, 1 main drain
    Purex-Triton TR-60 325 lb.sand filter. 2" Plumbing, Intex SWCG, TF-100 test kit.
    Link to pics of my pool! http://www.troublefreepool.com/my-oasis-t26558.html

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    Mod Squad Bama Rambler's Avatar
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    Re: Muriatic acid vs. dry acid

    I'm sure someone else knows but I don't see how it could harm your cell more than MA would. It does however add sulfates to your pool and the buildup of those might cause a problem, but no more acid than you'll be adding it would take a very long time to build up.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    JasonLion's Avatar
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    Re: Muriatic acid vs. dry acid

    The risk of using dry acid is only in the long term and can be avoided by minimizing the amount of acid you are using regularly and by doing regular water replacement. Dry acid contains sulfates, which accumulate slowly over time. If you use lots of dry acid over a long period of time and have minimal water replacement the sulfate level can eventually get high enough to pose some risk to the SWG cell. This is mostly an issue for people with cartridge filters who don't winterize, and so have minimal water replacement, and/or for people who keep their TA level too high and thus use substantial amounts of acid on a regular basis.
    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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    Re: Muriatic acid vs. dry acid

    I bet you can find MA if you look in the right place, and for way cheaper than the pool store. Try paint stores, and especially places that sell tile, grout and cement for home construction/renovation. I haven't been to Guam, but I've spent time in South America and Africa and MA is widely used in those places.
    Current: 28,000G 18'x36' I/G AnthonySylvan Plaster; Waterway 60 sq.ft. DE Filter; 1.0hp x 1.65 SF Two-Speed (B2982) WhisperFlo; 2004-Present
    Previous: 40,000G 20'x40' I/G Koven unlined WWII salvage 5/8" marine steel; Lomart Stainless Sand Filter; 3/4hp Hayward SuperPump; 1946-2003 (managed by me from about 1964)
    Ancient Taylor K-2000, upgraded with Taylor CH, TA, and FAS-DPD, and TFT CYA tests.

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    guamguy's Avatar
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    Re: Muriatic acid vs. dry acid

    I'd say I have a fair amount of water replacement, mostly due to splash-out. I don't need to backwash very often, every couple of months or so. I'll try and look at some paint and tile places. It just bothers me that Home Depot doesn't carry it, in the mainland they always have plenty of the stuff, and I'm usually in Home Depot at least twice a week
    12,800 gallon IG plaster kidney-shaped pool, waterslide, 800 gallon spa.
    1HP 2 speed Sta-Rite pool pump, 1.5 HP Sta-Rite spa jet pump. 2 skimmers, 1 main drain
    Purex-Triton TR-60 325 lb.sand filter. 2" Plumbing, Intex SWCG, TF-100 test kit.
    Link to pics of my pool! http://www.troublefreepool.com/my-oasis-t26558.html

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    Re: Muriatic acid vs. dry acid

    Where I am, HD "carries" it but only the 15% not the 30%. And it's not half the price, either.
    --paulr
    BBB "Intermediate Swimmer"
    IG plaster pool 18.5K gal, Hayward Pro-Grid DE filter, 3/4 HP Hydramax II; Polaris 380, 3/4 HP booster
    AG spa 325 gal, probably Sundance of some kind
    Water testing instructions on one page

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    guamguy's Avatar
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    Re: Muriatic acid vs. dry acid

    Quote Originally Posted by PaulR
    Where I am, HD "carries" it but only the 15% not the 30%. And it's not half the price, either.
    --paulr
    I would rather use the 15% MA than dry acid.
    12,800 gallon IG plaster kidney-shaped pool, waterslide, 800 gallon spa.
    1HP 2 speed Sta-Rite pool pump, 1.5 HP Sta-Rite spa jet pump. 2 skimmers, 1 main drain
    Purex-Triton TR-60 325 lb.sand filter. 2" Plumbing, Intex SWCG, TF-100 test kit.
    Link to pics of my pool! http://www.troublefreepool.com/my-oasis-t26558.html

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