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Thread: Too much Muriatic Acid

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    VG's Avatar
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    Too much Muriatic Acid

    HELP......my PH level was high and read to add 2 quarts of Muriatic Acid around the perimeter of the pool to lower the level. Well I did that then i noticed it said DO NOT add more than 1 quart in a 24 hour period......What is this going to do since I added it all at once?????

    Thank you!
    Venissa G

    Salt Water Inground 28,000 Gallon
    Installed Fall of 2011
    18x36 Grecian Vinyl
    Hayward Pro Grid Filter/DE 3620
    1.5 HP Superpump
    Cleaning with a Polaris 360
    Located in Sunny Georgia

    Chlorine is my perfume :)

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    Melt In The Sun's Avatar
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    Re: Too much Muriatic Acid

    Welcome to TFP!
    There's really no harm in adding more than a quart at once (I do it all the time), but it can be difficult to accurately calculate how much the pH will change when you add a whole lot at once. It's easy to overshoot. Don't worry, just test your pH again and see where it ended up.
    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
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    VG's Avatar
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    Re: Too much Muriatic Acid

    Thank you!!! I read it could cause harm to my equipment and I have been sick over it.........what a relief!!
    Thank you!
    Venissa G

    Salt Water Inground 28,000 Gallon
    Installed Fall of 2011
    18x36 Grecian Vinyl
    Hayward Pro Grid Filter/DE 3620
    1.5 HP Superpump
    Cleaning with a Polaris 360
    Located in Sunny Georgia

    Chlorine is my perfume :)

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    Re: Too much Muriatic Acid

    Quote Originally Posted by VG
    Thank you!!! I read it could cause harm to my equipment and I have been sick over it.........what a relief!!
    Acids can cause harm to equipment if not properly applied. Since I have a vinyl covered pool, I take the precaution of first diluting the acid before adding it to the pool and slowly pouring it into the deep end right over the return to get it circulating quickly. I follow up immediately with a compete brushing of the surfaces of the liner to prevent any accumulation there and to hasten the mixing process. Having been the victim in the past of premature liner dysfunction, I have taken these precautions and they have worked out well. The current liner is six years old, and still tight as a drum. Of course if you don't have a vinyl liner, you're probably ok just pouring the acid in the deep end over the return. Never pour it directly into the skimmer box particularly if you have a heater, saltwater generator, or any equipment attached to your system that would be prone to acid corrosion.
    22,000 gallon ig vinyl solar heated (panels and cover) zeolite filtrate

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    ultra800_96's Avatar
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    Re: Too much Muriatic Acid

    I made the mistake myself just this morning. PH was 7.8, wanted to lower to 7.2 ( rising ph with swcg) Calculator said 2qts + 2cups. Added. Then read on bottom "effects of adding 80 oz 31.4%" =1.49 drop in ph. Almost panicked, checked hr later & throughout the day, landed on 7.0. Turns out I had been playing around with borates addition in the calculator & with 50ppm borates, that would have been correct. w/o borates, 55 oz. By the way, since putting up my vinyl lined pool in the mid 90's, I have always added muratic directly in front of a return, slowly. I'm still on the original liner.
    12,900 Gal. 24' X 48" ABG Vinyl Round (17th Birthday)
    1HP Hayward Pump w/S180T Hayward Sand Filter
    AquaTrol RJ SWCG 2011 startup
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    50ppm Borates, June '12

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    linen's Avatar
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    Re: Too much Muriatic Acid

    Quote Originally Posted by ultra800_96
    Then read on bottom "effects of adding 80 oz 31.4%" =1.49 drop in ph. Almost panicked, checked hr later & throughout the day, landed on 7.0. Turns out I had been playing around with borates addition in the calculator & with 50ppm borates, that would have been correct. w/o borates, 55 oz.
    I am not sure of all the "behind the scenes" calculating that "effects" section does, but I find it is pretty basic and must ignore some of the other factors. For ph, I always play with the numbers above...and that seems to give me better predictions.
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

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    ultra800_96's Avatar
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    Re: Too much Muriatic Acid

    Exactly what I found out linen. It has some footnotes below the "effects" box discussing PH calculations, that I later read, which made me feel better, along with actual testing.
    12,900 Gal. 24' X 48" ABG Vinyl Round (17th Birthday)
    1HP Hayward Pump w/S180T Hayward Sand Filter
    AquaTrol RJ SWCG 2011 startup
    TFP Method since '09, TF100
    50ppm Borates, June '12

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    VG's Avatar
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    Re: Too much Muriatic Acid

    Quote Originally Posted by ultra800_96
    I have always added muratic directly in front of a return, slowly. I'm still on the original liner.
    I will add it directly in front of return in deep end from now on. I have only been a pool owner since last Oct when it was complete so I am still learning the ropes. Thanks!
    Thank you!
    Venissa G

    Salt Water Inground 28,000 Gallon
    Installed Fall of 2011
    18x36 Grecian Vinyl
    Hayward Pro Grid Filter/DE 3620
    1.5 HP Superpump
    Cleaning with a Polaris 360
    Located in Sunny Georgia

    Chlorine is my perfume :)

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