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Thread: My numbers...PH creeps up...lots of acid

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    Join Date
    Sep 2008
    Location
    Northern CA
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    My numbers...PH creeps up...lots of acid

    First off, let me say, like so many others: this site is awesome. The knowledge and support is incredible.
    New pool owner here: in-ground gunite, with fill in January, 2009
    My numbers today are:

    FC: 1.96
    TC: 2.21
    PH: 7.9
    TA: 114
    CYA: 51
    Cal. Hardness: 510
    CSI (at 68 degrees): +.7


    Water is crystal clear.
    My PH is constantly moving up...seems like every other day I'm hitting with acid.
    The CH has always been high - yet when I test our fill water, it's more in the 200 range.

    Is what I'm experiencing (the creeping PH and high CH) associated with the new plaster cure?
    I understand it can take months to completely cure...

    Any other ideas/suggestions...? Or do we seem to be ok?

    Thanks in advance for any insight.
    Northern CA
    IG gunite/plaster, completed 1/09; 22 x 40, 8 ft. deep; Hayward pumps; waterfall; diving rock

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    JasonLion's Avatar
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    May 2007
    Location
    Silver Spring, MD
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    Re: My numbers...PH creeps up...lots of acid

    You can significantly reduce your PH drift by lowering your TA to around 60 or 70. Your PH will still go up because of the new plaster, but not as much.

    What are you using for testing? Most of the test system that give results that look like yours tend to have acuracy problems.
    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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    Join Date
    Sep 2008
    Location
    Northern CA
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    Re: My numbers...PH creeps up...lots of acid

    I will lower the TA using acid and aeration...sounds like a plan.
    I use the LaMotte kit. I've tested it against my TFP kit and I don't see any difference, which leads me to believe the unit is accurate...
    and it's much easier and less subjective for my eyes.
    Will see if lowering the TA does the trick.
    Is the high CH a result of the new plaster?
    Northern CA
    IG gunite/plaster, completed 1/09; 22 x 40, 8 ft. deep; Hayward pumps; waterfall; diving rock

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    duraleigh's Avatar
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    Apr 2007
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    Sebring, Florida
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    Re: My numbers...PH creeps up...lots of acid

    NPG,

    Welcome.

    Is the high CH a result of the new plaster?
    Yes. That will diminish over the next few months and be inconsequential next season.

    Keep your pH a little lower than you currently report (7.4 or so ) and watch it carefully and you shoud have no calcium precip issues.

    The testing you are using is infamously innaccurate with the CYA test results. I'd check the CYA test against the drops based (TFP100) and, if they are different, the TF100 is normally correct.
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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