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Thread: pH rising faster?

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    efm1972's Avatar
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    pH rising faster?

    Split by moderator from HERE. Please start your own thread for your own questions. Thanks, jblizzle.

    I read through this string and have the same question. This is 2nd season with pool (pool was finished May 2012). In the first part of this summer, I really did not have the issue of pH going up so rapidly. It did go up, but I was only adding about 1/4 gallon Muriatic Acid about once a week. Not sure what changed (pool filter on the same 10 hours/day and we do not run our fountain, etc.), but I am now adding 1/4 gallon Muriatic Acid about every 2 - 3 days now. Any ideas? Here are my test results:

    FC = 5.2
    TC = 5.2
    pH = 7.9
    TA = 90
    CH = 260
    CYA = 40

    Thanks
    18,500 gallons, DE filter, IG
    Onyx Ansylbrite (colored) plaster
    Jandy Pump 1.0 HP, Zodiac Filter (flow rate = 120 gpm)
    Installed May 2012

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    JasonLion's Avatar
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    Re: pH rising faster?

    If your TA went up, that could account for the difference. Lower TA levels will have less PH drift.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    Mod Squad jblizzle's Avatar
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    Re: pH rising faster?

    Maybe the top off water is also at a higher pH and TA than before?
    Jason, TFP Moderator
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    Richard320's Avatar
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    Re: pH rising faster?

    Any chance you got the "safe" fumeless acid, which is half-strength?
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
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    Mod Squad jblizzle's Avatar
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    Re: pH rising faster?

    Quote Originally Posted by Richard320
    Any chance you got the "safe" fumeless acid, which is half-strength?
    This could be a VERY valid explanation.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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    efm1972's Avatar
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    Re: pH rising faster?

    Thanks for all the responses to my question. I did check my Muriatic Acid, which I purchase from Home Depot and I can confirm that it is not fumeless. Also, when I fill my test bottle, I do so from the same spot in the pool and from the same depth each time. After looking at my test log (yeah, I keep a spreadsheet of all my pool water tests), it is most likely due to a rise in Alkalinity. For the first part of this season, I had kept my TA in the 80 - 90 range. For some reason, I added enough Baking Soda to take TA to 110. Now that it is back down around 90, I am not adding Muriatic Acid as frequently.

    Thanks again.
    18,500 gallons, DE filter, IG
    Onyx Ansylbrite (colored) plaster
    Jandy Pump 1.0 HP, Zodiac Filter (flow rate = 120 gpm)
    Installed May 2012

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