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Thread: PH Not Lowering with MA

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    PH Not Lowering with MA

    I've used the pool calculator to estimate the amount of MA needed to lower ph from 8.0 to 7.2 (approximately 1/2 gallon). I added a full gallon of MA and my ph has hardly dropped anything noticeable. Using the tf100 test kit. Any suggestions? Got the MA from Lowes.
    40,000 gallons (20' x 40'); IG; vinyl liner
    sand filter
    BBB method for 2 full seasons
    tf100 test kit
    central Illinois

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    Richard320's Avatar
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    Re: PH Not Lowering with MA

    Odds are, you ended up with the half-strength low-fuming stuff. Study the label and look for the concentration. Enter the strength in the calculator.

    Be sure you set the pool volume and the TA correctly, too, because if they went to the default settings, it won't work.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
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    Re: PH Not Lowering with MA

    What is the strength of the acid?
    What was the TA before adding the acid and after adding the acid?

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    Butterfly's Avatar
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    Re: PH Not Lowering with MA

    Have you confirmed the strength of the MA? ie, read the label? Some is only half strength.
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    Patrick_B's Avatar
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    Re: PH Not Lowering with MA

    I would agree, the acid is likely not 31%, but without even seeing TA, a half gallon of MA won't do much in a pool that size starting from 8.0 pH. Whether it is strength or volume (or both) you are not getting enough acid in the pool yet.

    Check the strength, double check the Pool Math cculations just to be sure. You can find full strength MA at local hardware stores usually. You might even find a local pool builder supplier willing to sell to the public. I found one, and the acid is $3.00 cheaper per gallon. Full 31.45% HCL (MA)
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    Re: PH Not Lowering with MA

    I've now used the correct amount based on strength and am still seeing only small results (not working out the way the calculator says it should). I suppose I just continue to add more muriatic? No adverse affects if I continue to equipment, etc. . . ?
    40,000 gallons (20' x 40'); IG; vinyl liner
    sand filter
    BBB method for 2 full seasons
    tf100 test kit
    central Illinois

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    Richard320's Avatar
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    Re: PH Not Lowering with MA

    Quote Originally Posted by birkesl View Post
    I've now used the correct amount based on strength and am still seeing only small results (not working out the way the calculator says it should). I suppose I just continue to add more muriatic? No adverse affects if I continue to equipment, etc. . . ?
    Maybe your pool is bigger than you think it is?
    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: PH Not Lowering with MA

    What is your TA?

    How much muriatic acid did you add?

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    Re: PH Not Lowering with MA

    To answer your question, there are no adverse affects. It might be worthwhile to change out your pH test block and chemistry if they are more than 6 months old.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
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    Re: PH Not Lowering with MA

    Quote Originally Posted by JamesW View Post
    What is your TA?

    How much muriatic acid did you add?
    And what is the strength of the acid you have?

    If you would answer some of the questions that have been asked of you, we would be better able to help.
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    Re: PH Not Lowering with MA

    I'll report back soon on new test data and added MA change in effect. . .
    40,000 gallons (20' x 40'); IG; vinyl liner
    sand filter
    BBB method for 2 full seasons
    tf100 test kit
    central Illinois

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