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Thread: Test left out - color changed

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    Test left out - color changed

    So I do my routine tests as a part of a SLAM but leave all the chemicals in the vial (lazy...and I was up at an ungodly hour to test). Anyway, overnight test has FC 15 and 0 cc but left it there and this morning (ok, was morning before too - but now everyone else awake) and the chemicals/water in the vial are now purple instead of clear. Explanation anyone? (evap of chlorine?)
    30,000 Gallons IG, DE filter, SWG, Plaster, 2 HP centurion for filter and same for waterfall, 20+ years old, Polaris 360, hot tub attached

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    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    SouthWest Alabama

    Re: Test left out - color changed

    It's normal for the test to run back pink if you leave it sit for a little while (and I guess purple if you leave it long enough).
    Dave J. TFP Moderator
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    jcowart's Avatar
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    Jun 2012
    Labelle, TX

    Re: Test left out - color changed

    That's normal. You can also change the ph test. Don't shake up your sample bottle or blow across your sample. It will give a higher reading. I have seen it go back pink, but never purple.
    17500 gallon Doughboy AGP, Hayward DE filter, waiting for the 1.5hp DB pump to go out.
    Learn to take the advice here and be trouble free or use the pool store's advice. "You can't do both and get very far"

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    Patrick_B's Avatar
    Join Date
    Jun 2011
    Midland TX

    Re: Test left out - color changed

    I's simply a degradation of the reagents and reactions of the test. Nothing to be concerned about except dirty glass ware. Best to rinse right away and be clean for next time and let nothing deposit in your vials.
    TFP Moderator
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