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Thread: High Ph in new plaster pool

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    High Ph in new plaster pool

    We put in a new 35,000 gallon plaster lined pool last September. The ph constantly goes up and I use muriatic acid to bring it down. My question, is it normal to have to put in a gallon of acid every second or third day. The ph will go down to about 7.4 and in a few days up to 8.0 or higher. I know that it was going to use acid till the plaster cured, but I think i'm passed that point.
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    Richard320's Avatar
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    Re: High Ph in new plaster pool

    Welcome!

    Answer: Yes. 35000 gallons is a pretty big pool. The TA of 90 isn't helping, nor is the SWG. Just keep knocking it down. You might want to target 7.2 pH. It'll buy you an extra day between doses, and the CO2 outgassing is faster at lower pH, so the TA will drop a little quuicker.
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    Re: High Ph in new plaster pool

    Quote Originally Posted by Richard320 View Post
    Welcome!

    Answer: Yes. 35000 gallons is a pretty big pool. The TA of 90 isn't helping, nor is the SWG. Just keep knocking it down. You might want to target 7.2 pH. It'll buy you an extra day between doses, and the CO2 outgassing is faster at lower pH, so the TA will drop a little quuicker.
    Should I raise the TA ? Is this an excessive amount of acid?

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    Mod Squad pooldv's Avatar
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    Re: High Ph in new plaster pool

    No, higher TA contributes to PH rise. Lower PH helps to slow PH rise. Adding acid repeatedly to lower your PH will also lower your TA, as low as 60 is fine.
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    Richard320's Avatar
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    Re: High Ph in new plaster pool

    Quote Originally Posted by TIDE500 View Post
    Should I raise the TA ? Is this an excessive amount of acid?
    No, not excessive given fairly new plaster, high TA, SWG and a large pool. My plaster is close to ten years old and my pool is half the size of yours and I use about a quart a week. And I don't have a SWG.
    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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