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Thread: Muriatic acid question

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    phalcon51's Avatar
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    Muriatic acid question

    I'm using the Pool Calc app on my iPod and in the setup section it asks me to specify the acid strength. It defaults to 31.34%. Is this typical for pool store acid in CA? The bottles I bought from Leslie's don't give any strength information on the box or the label. The other choices are 15.7%, 28.3% and 34.6%. Can anyone confirm what strength acid I'm using or how I can determine it?

    Thanks
    26,200 gal. 35' x 16' Plaster IGP (50 yrs. old), Hayward 48 sq. ft. DE filter, Hayward EcoStar VS pump, Intellichlor IC-40 SWCG, The Pool Cleaner 4X suction, Pool Skim and Pool Devil skimmers. Re-plastered Sept. 2010.

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    Richard320's Avatar
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    Re: Muriatic acid question

    That's pretty standard concentration as far as I can tell. I used to buy it at Leslies, but I found a cheaper source with returnable jugs. It has to say somewhere on the box or the bottle. But anyway, here's how you can tell: add what poolcalulator tells you, run the pump for an hour or so and recheck pH. If it went down the right amount, you have the right concentration. Assuming you have the volume correct....
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Re: Muriatic acid question

    Leslie's Muriatic Acid, as shown here, has the concentration of Hydrochloric Acid on the box. This link gives you access to the MSDS which gives a concentration of 25-36 and is most likely to be 31.45% as that is standard.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

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    phalcon51's Avatar
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    Re: Muriatic acid question

    Thanks for the quick replies. This forum is great!

    Quote Originally Posted by Richard320
    I used to buy it at Leslies, but I found a cheaper source with returnable jugs.
    Can you name your cheaper source? I live in Monrovia, not far from San Dimas.
    26,200 gal. 35' x 16' Plaster IGP (50 yrs. old), Hayward 48 sq. ft. DE filter, Hayward EcoStar VS pump, Intellichlor IC-40 SWCG, The Pool Cleaner 4X suction, Pool Skim and Pool Devil skimmers. Re-plastered Sept. 2010.

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    Re: Muriatic acid question

    I get mine at wharehouse pool supply, 4 gallons for 19.99. Home depot sells 2 gallons for 11.99.
    13,000 Plaster IG Pool approx
    Hayward C5030 Cart Filter
    Emerson 1081 EB653 1.0 HP 1.40 S.F. 3450 RPM
    Pool Calculator, Pool School, TF Test Kits

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    Richard320's Avatar
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    Re: Muriatic acid question

    Quote Originally Posted by phalcon51
    Thanks for the quick replies. This forum is great!

    Quote Originally Posted by Richard320
    I used to buy it at Leslies, but I found a cheaper source with returnable jugs.
    Can you name your cheaper source? I live in Monrovia, not far from San Dimas.
    Johnny's Pool Supply In Covina. On Barranca Ave.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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