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Thread: Question about CH test

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    Question about CH test

    I have a question about the CH test in the TF100 test kit. When testing my CH the solution starts to turn blue with many red specs at about 140, the solution does not turn COMPLETELY blue with no red specs until about 250. My assumption is that the 250 is the correct reading. Am I correct?
    25K Gal, IG gunite, Hayward 1HP pump, Hayward DE filter, Pentair Mastertemp 250, TF100 test kit

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    Re: Question about CH test

    Most likely metal ion interference. Add 5 drops of the last reagent first and then do the test normally. Count the 5 drops in the total number of drops.
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    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Sebring, Florida

    Re: Question about CH test

    And, yes, your assumption is correct @ 250ppm
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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