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Thread: test question

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    test question

    is the hth chlorine/bromine test the same as free chlorine test?

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    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: test question

    No, The inexpensive HTH six way test kit includes the OTO chlorine test which measures TC (total chlorine) from 0 to 5 (though anything 3 or higher looks the same to most people). TC = FC (free chlorine) + CC (combined chlorine). You want FC, you don't want CC. Often CC is zero, and TC = FC. But with that test kit things can get confusing when CC is above zero.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    Re: test question

    so if three days in my oto chlorine test shows 3-5 is it safe to assume i have no cc?

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    Re: test question

    And you are right i really cant tell the difference between the 3-6 color and the 5-10 color.

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    Join Date
    Jun 2012
    Howell, NJ

    Re: test question

    There is no way to know if you have CC with the OTO test.
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