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Thread: Daily Muriatic Acid

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    calypso's Avatar
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    Daily Muriatic Acid

    New pool owners (stats below). I've read pool school and have been using Taylor k-2006 kit for a couple weeks. I resolved my CYA issue and was hoping the FC and pH would balance out too, but I'm still putting about 70 oz of bleach and 15 oz of Muriatic Acid every couple of days. My husband says we should keep the pump running all the time even though I have read here that four hours is plenty. He also likes the sound of running water, but I convinced him to keep the jet under the water. Am I right that this is causing our pH to stay high? I don't like dealing with the Muriatic Acid and would like to get our pH stabilized. Could the high pH be from the initial fill from our well water?
    Thanks!

    Today's results (typical)
    FC 1
    pH 8
    TA 180
    CYA 30
    11,000 gallon (16'x27'x54") Above Ground, Sand Dollar Top Mount Filter, Baquapure 2200 2 speed Pump 60 gallons/minute, bought used on craigslist & had a professional setup and install with new liner in 5/2014

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    Charlie_R's Avatar
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    Re: Daily Muriatic Acid

    Have you tested your well water?

    I see your TA is a bit high. That will come down over time if you keep adding acid to bring your pH down to 7.2, and let it climb back to 7.6 - 7.8.

    Other than that, you may need to SLAM your pool, since your typical FC is a bit low for your CYA. You could have something growing in your water, which would explain the high LC usage.

    Pool School.
    15'x48" 4500 gallon Intex pool, buried 1.5 ft. Pac-Fab Dynamo 3/4 hp pump. Hayward S180T sand filter, bought used. Taylor K-2006 test kit. Rocket mass heater based wood fired pool heater.

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    calypso's Avatar
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    Re: Daily Muriatic Acid

    It's been years since we tested the well water. My husband says we have to tell them what we want tested.

    Two days after we filled the pool, it was green. I went to the pool store and got a shock treatment and started looking for answers and thankfully found your site. It was cal hypo. I shouldn't SLAM after that right? The water is clear and looks good.

    How much longer will I need to add Muriatic before I'm down in range? Anything else that can be keeping the pH high?

    Thanks
    11,000 gallon (16'x27'x54") Above Ground, Sand Dollar Top Mount Filter, Baquapure 2200 2 speed Pump 60 gallons/minute, bought used on craigslist & had a professional setup and install with new liner in 5/2014

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    Patrick_B's Avatar
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    Re: Daily Muriatic Acid

    Welcome to the forum!

    Yes, agitation of the water surface causes aeration and increases the speed of pH rise. Not a big deal but it does. I'm not sure about four hours, every pool is different and yours may well need more. It doesn't need 24/7 run time, but likely more than four. Start trimming that down and you will find out.

    You need to control the pH with testing and acid addition, so keep after it. Not critical in a vinyl pool, but you want it 7.8 or below. Anywhere from 7.2 up to there is good.
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    Re: Daily Muriatic Acid

    Test the TA of your fill water. I have been having the same issue this year because I lost a lot of water over the winter and my well water TA is 650. Nothing you can do but keep adding acid until it stabilizes. Also get your FC up, it shouldn't ever drop below 2.
    JD - 28' Round Above Ground Pool, 17,000 Gallons. Dual speed Jacuzzi pump with cartridge filter. Dual speed 1 HP pump, Hayward S210T sand filter
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    Charlie_R's Avatar
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    Re: Daily Muriatic Acid

    When I suggested that you test your well water, I was meaning with your K-2006. That way you will know how water additions will affect your pool.
    15'x48" 4500 gallon Intex pool, buried 1.5 ft. Pac-Fab Dynamo 3/4 hp pump. Hayward S180T sand filter, bought used. Taylor K-2006 test kit. Rocket mass heater based wood fired pool heater.

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    calypso's Avatar
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    Re: Daily Muriatic Acid

    Charlie - thanks - I don't know why I didn't think of that. I just tested the well water and our pH (8) and Total Alkalinity (240 or higher?) are high so it makes sense that I'm having a hard time getting it to stabilize. Makes sense that the CYA was 0 too. I'd only been buying a gallon of acid at a time, but I guess I'll go ahead and get a supply.
    11,000 gallon (16'x27'x54") Above Ground, Sand Dollar Top Mount Filter, Baquapure 2200 2 speed Pump 60 gallons/minute, bought used on craigslist & had a professional setup and install with new liner in 5/2014

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    Re: Daily Muriatic Acid

    Are you using this sites "Pool Math" calculator to figure out how much acid to use to get from A to B ?? http://www.troublefreepool.com/calc.html

    You might only want to get two gallons of acid at a time. Depending on how far you have to drive to get it. Nice not to have too much sitting around the house once your pool pH stabilizes.

    Your first post has a CYA of 30 which is a little low but the post above says it's "0", I'm confused
    '70s IG Vinyl 32K gal, Lazy L, Hayward SuperPump 1.5hp 120V, S240 Sand Filter W/DE
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    aussieta's Avatar
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    Re: Daily Muriatic Acid

    ph test wont read above 8 so that may mean you have ph 9 or more
    add required acid to bring from 8 to 7.5
    after one hour with pump running retest and repeat until you get a valid test result
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    calypso's Avatar
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    Re: Daily Muriatic Acid

    sorry for the confusion - the last test results were for the well water as Charlie suggested. Glad I have the CYA resolved; now I'm just dealing with pH and Chlorine. We are definitely not close to stores with acid.

    I had been trying not to add more than once a day - should I go ahead and keep adding throughout the day?
    11,000 gallon (16'x27'x54") Above Ground, Sand Dollar Top Mount Filter, Baquapure 2200 2 speed Pump 60 gallons/minute, bought used on craigslist & had a professional setup and install with new liner in 5/2014

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    Re: Daily Muriatic Acid

    You should be OK with the pump running to add acid every 30 to 60 minutes.
    '70s IG Vinyl 32K gal, Lazy L, Hayward SuperPump 1.5hp 120V, S240 Sand Filter W/DE
    Solar Blanket, Well Water, Borax Added, TF-100 tester. ? too cold
    1979, 275gal Conway Emerald Spa P-100-2, ES-2 Spa Pack, bromine floater, indoor
    TF-100, Best test kit - TFTestkits.net
    Please help keep the lights on, become a TFP Supporter!

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