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Thread: Does Ph naturally rise in the pool?

  1. #1
    Bosch232 is offline Registered+ Thread Analyst Bosch232 0
    Join Date
    Aug 2012

    Default Does Ph naturally rise in the pool?

    Spring is finally here and as a still-inexperienced new owner, I broke out my shiny new Taylor kit today.

    Last year I only used test strips on the pool water (new guy, remember). They always said my Ph was high. I just tested with the Taylor and it's saying 8.0. Pretty high. (I have done nothing yet this spring to open the pool yet. I'm just playing with the Taylor kit.)

    Now here's my question: I also rinsed and tested the water at the hose end. It says 7.0. So does ph naturally go up over time? Is this pattern telling me something? Any thoughts are appreciated.
    16x32 Oval AG vinyl pool; Media Master sand filter; 1.5 hp 1 speed pump; 10 hrs; Rural utility water; Taylor K-2006

  2. #2
    chem geek is offline PF Supporter Whibble Konker chem geek 4 stars chem geek 4 stars chem geek 4 stars chem geek 4 stars
    Join Date
    Nov 2004

    Default Re: Does Ph naturally rise in the pool?

    Pool water is intentionally over-carbonated to provide a pH buffer and to saturate the water with calcium carbonate to protect plaster pool surfaces. Such over-carbonation results in carbon dioxide outgassing and this causes the pH to rise over time. The rate of rise is related to the amount of over-carbonation which you can see from this chart that as the pH rises there is less over-carbonation so it slows down as the pH approaches around 8.4, depending on the TA level. You can see that a higher TA and lower pH is more over-carbonated so will outgas faster. The chart doesn't show the effect that the rate of outgassing varies as the square of the TA level, so a higher TA level can have the pH rise noticeably fast, especially if there is aeration of the water (waterfalls, spillovers, fountains, etc.).
    15.5'x32' rectangle 16K gal IG concrete pool; 12.5% chlorinating liquid by hand; Jandy CL340 cartridge filter; Pentair Intelliflo VF pump; 8hrs; Taylor K-2006 and TFTestkits TF-100; utility water; summer: automatic; winter: automatic; ; PF:7.5

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