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Thread: OTO Test Turning Green or Blue

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    Join Date
    Apr 2014

    OTO Test Turning Green or Blue

    What does it mean if the water in a simple OTO Test turns Green or Blue?


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    Mod Squad Patrick_B's Avatar
    Join Date
    Jun 2011

    Re: OTO Test Turning Green or Blue

    You do mean the Chlorine side right? Just curious but I'm not going to be able to say.
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    JasonLion's Avatar
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    May 2007
    Silver Spring, MD

    Re: OTO Test Turning Green or Blue

    It generally means that you used the wrong reagent, or your OTO reagent has gone bad, or the water sample is contaminated with other reagents. Valid colors are clear, yellow, orange, red, and various shades of brown.
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