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Thread: Alkalinity test in the T100

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    Join Date
    Oct 2012
    Small Town Indiana

    Alkalinity test in the T100

    Any thoughts about color change? Typically it is blue and then you add drops of #9 until it turns red (or in high chlorine it turns yellow). Any thoughts if it just turns a different color or blue? I wasn't sure if I "overshot" the red? Has anyone seen this before. I tested it yesterday and that didn't happen. Just a curiosity question.
    18,000 Gallons, 16 X 32, Sand Filter, IG, Vinyl Liner, SWCG, Built 2011, Opened April 2012, TF-100, speed stir,

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    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Tucson, AZ

    Re: Alkalinity test in the T100

    You can find more detailed info about all the tests here:

    Jason, TFP Moderator
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  3. Back To Top    #3

    Join Date
    Mar 2007
    San Rafael, CA USA

    Re: Alkalinity test in the T100

    It usually starts of green and goes to red after you've added enough R-0009 titrant. If it starts off blue then that usually indicates a high chlorine level in which case it will go to yellow. You can add more R-0007 thiosulfate drops to reduce the chlorine at the start of the test so that you have a normal green to red transition.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
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