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Thread: PH level at closing

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    PH level at closing

    Hello,

    Last year when our pool was closed I brought the PH level down to 7.0 because the PH levels rise quickly in my pool. After opening the PH level was well above 8.0. I remember having to put alot of muratic acid in and it took 2 days to bring it down.

    Fast forward to this years closing (which is tomorrow)...I keep the PH level around 7.4-7.6 but need to put muriatic acid in every week. So my question is....should I just lower it to the 7.0 again this year and hope for the best? Or do I lower it into the 6.8 range? The pool is 2 years old.

    Thank You!
    28,000 IG Free Form Gunite with quartz finish
    Pentair Quad DE filter, Intelliflo VS+SVRS
    Polaris 280, Sta-Rite 400K Heater-Propane

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    JasonLion's Avatar
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    Re: PH level at closing

    That mostly depends on what your TA and other levels are. Could you post a full set of water test results? Also, when was your plaster installed?
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    Re: PH level at closing

    Pool was finished in October of 09

    FC....3 (at the moment)
    PH....7.8
    TA....50
    CH...280 (low due to all the rain we have had)
    Temp....around 62
    CYA...around 10 (again low to all the rain)
    28,000 IG Free Form Gunite with quartz finish
    Pentair Quad DE filter, Intelliflo VS+SVRS
    Polaris 280, Sta-Rite 400K Heater-Propane

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    JasonLion's Avatar
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    May 2007
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    Silver Spring, MD
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    37,879

    Re: PH level at closing

    With those numbers, I would only lower the PH just a little, say to 7.5 or 7.6. You could go a little lower if you want, but I would not take the PH below 7.3. If you lower PH too much you could have some etching of the plaster over the winter.

    My guess is that your chemical levels were very different last year, resulting in the dramatic PH increase over the winter, though there are some other less likely possibilities.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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