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Thread: PH testing question

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    Join Date
    Jun 2008
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    SE Michigan
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    PH testing question

    Hello, I have been second guessing my PH test lately, after 10-15 seconds my ph reads 7.4 but when i let it sit for a minute or so while i do another test it drifts up to 7.8-8.0. Could someone please confirm when to read the test or is something wrong? I am testing with a tf-100 kit. Thanks Scott

    fc-5.5
    cc-0
    ph-7.4?
    ta-120
    ch-30
    cya-30+

    18x34 ag, 14000 gal.
    18x34 Doughboy/13000 gal.approx./DE filter

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    reebok's Avatar
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    Apr 2009
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    Lakeland, FL
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    Re: PH testing question

    put the drops in, cap it, invert a few times and read it.
    16x32 21,000 gallon in-ground exposed aggregate, 1.5hp pump, 120 sqft catridge filter, birdcage, solar panels, aquavac tigershark qc robot.

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    Join Date
    Jan 2009
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    Cupertino, CA
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    Re: PH testing question

    One of the chem/test gurus may have a detailed chemical-process answer, but for pH you read it right away.
    --paulr
    BBB "Intermediate Swimmer"
    IG plaster pool 18.5K gal, Hayward Pro-Grid DE filter, 3/4 HP Hydramax II; Polaris 380, 3/4 HP booster
    AG spa 325 gal, probably Sundance of some kind
    Water testing instructions on one page

  4. Back To Top    #4
    Guest

    Re: PH testing question

    Add the reagent to the sample, cap , invert 3-4 times to mix (don't shake), and read. If you are going to do demand tests do them immediately after the pH test.
    pH can drift up on sitting, particularly if your TA is high.

  5. Back To Top    #5

    Join Date
    Jun 2008
    Location
    SE Michigan
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    Re: PH testing question

    Thank you, Scott
    18x34 Doughboy/13000 gal.approx./DE filter

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