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Thread: Muriatic Acid in New Pool

  1. Back To Top    #1

    Join Date
    Aug 2009
    Location
    Central Texas
    Posts
    4

    Muriatic Acid in New Pool

    Our new inground, plaster/pebble pool was crystal clear and perfectly balanced. Then, workers came to repair some gouges and smooth the pebble bottom. They did this while the pool was filled and used several gallons of muriatic acid. This lowered the ph to the bottom of the color scale, so we added borax according to the calculator, and baking soda to raise the TA, which was also low. Everything is fine again, the water is sparkling and feels great. But is it normal to have all these chemicals? Can this stew of acid and borax even be called "water" at this point? This is our first pool. We love it, but it seems very strange to swim in muriatic acid and borax, especially the acid, which is used to etch stone! Should we empty the pool and start again? We would really appreciate some reassurance or advice.
    About 13500 Gal. 24'x52" AG, Sand filter, 2HP Columbia, Timer, Lil' Shark auto cleaner.

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    MikeInTN's Avatar
    Join Date
    May 2007
    Location
    Middle Tennessee
    Posts
    1,335

    Re: Muriatic Acid in New Pool

    Welcome to TFP!

    No ma'am, there's no need to empty the pool and start again. Borax and muriatic acid are the primary chemicals used to help regulate the pH of the water. The borax and muriatic acid don't stay in those forms once in the water. The chemistry can get complex, but suffice it to say that if the water's in balance and the FC is where it needs to be, then your water is perfectly safe.

    BTW, be prepared to keep adding acid for a while. New plaster will require pretty regular additions of acid, as the plaster causes the pH and TA to rise until it's cured, which can take up to a year.
    24' x 52" AGP - approx 13,500 gallons
    Pentair Optiflo 1 hp/2sp pump w/ Swimpro Voyager 150 sq ft cartridge filter
    Intex 8110 SWCG
    "Fear the Schnauz!"

  3. Back To Top    #3

    Re: Muriatic Acid in New Pool

    Welcome to TFP, and congrats on your new pool!

    8000 gallon 20' x 48" round vinyl frame pool, 12" sand filter (don't have the specs on the pump), TF100 test kit
    Handy Links: PoolMath, TF-100 Test Kit, Pool School, CYA-Chlorine Chart
    "Shock" is a process, not a product!

  4. Back To Top    #4

    Join Date
    Jul 2007
    Location
    Suwanee, GA
    Posts
    527

    Re: Muriatic Acid in New Pool

    As Mike said, you'll be adding a lot of acid the first few months. I was adding over 2 gallons a week the first few weeks and even at the 6 month mark I was still adding a lot of acid to keep the pH in check. After about a year and a half, my acid consumption had finally gone down. I'm now adding acid once a month perhaps.
    Gary
    21k gal SW, IG Gunite PebbleSheen, 1HP Jandy, Jandy 340 filter, Polaris 280, 17' fiberglass slide w/ 2HP pump.

  5. Back To Top    #5

    Join Date
    Aug 2009
    Location
    Central Texas
    Posts
    4

    Re: Muriatic Acid in New Pool

    Thank you so much for the great replies. I'm in the water again!
    About 13500 Gal. 24'x52" AG, Sand filter, 2HP Columbia, Timer, Lil' Shark auto cleaner.

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