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Thread: Unstable PH

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    Join Date
    Aug 2015

    Unstable PH

    I had to go through a SLAM process a few weeks ago to kiill algae and phosphates. Since then my PH has been unstable. My alkalinity is fine, my chlorine is fine for a day or two and the it disappears and my PH wil rise to 8.0. I have used Acid twice to get it down, which it does, but two days later it is right back up there. Thoughts?
    33ft Above ground
    24,000 gallons

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    Patrick_B's Avatar
    Join Date
    Jun 2011
    Midland TX

    Re: Unstable PH

    Hi Jennifer and welcome to TFP

    So, a few things here. SLAM doesn't kill phosphates. Usually we don't address them because in almost every situation they are overcome by a reasonable amount of free Chlorine. When you say fine regarding the various parameters, can you please clarify that with the actual test results please? If you could post all your results and let us know how you obtained them, we can offer clear advice. Also, please clarify what you mean by unstable pH. In almost all pools, pH tends to rise, so what you briefly describe is pretty normal. Let us know about the above, and we can help.
    TFP Moderator
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    Mod Squad JVTrain's Avatar
    Join Date
    Feb 2014
    Central Minnesota

    Re: Unstable PH

    Posting some test results will help us help you. We don't really do advice based on "my levels are fine." If they were, then you wouldn't be here. What test kit are you using? How are you chlorinating the pool? Was it a proper SLAM with all criteria passed or was it simply a shock and pray? More details are needed to help you out.

    Welcome to TFP!
    Joel - TFP Moderator - Minnesota - **Become a TFP Supporter!** Helpful Links: ABCs of Pool Water Chemistry - SLAM Procedure - Chlorine/CYA Chart
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    jccams's Avatar
    Join Date
    May 2010
    Dexter, MI

    Re: Unstable PH

    What I found with my PH drift was that my pool likes the TA down around 60, once that happened I never had any PH drift, rock solid. So I guess what I'm saying is a fine TA # for my pool that keeps PH stable may not be appropriate in yours. My experience tells me that once the TA is right for your pool the PH will be stable.
    24,000 gal vinyl Lazy L, 1 hp pump, DE Filter, Pentair 250K heater, Letro Legend pressure side pool sweep

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    Mod Squad woodyp's Avatar
    Join Date
    Apr 2010
    East Texas

    Re: Unstable PH

    Yep, we need a TA number please! Any SWG? Have you been aerating the pool to cool it down?
    16x32x52" Steel Cornelius Miramar AGP Vinyl liner 13,100 gal. Buried 2 ft.
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