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Thread: Testing TA, when to consider color change complete?

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    FastCougar's Avatar
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    Testing TA, when to consider color change complete?

    I'm currently lowering my TA with PH lowering and aerating and I have a question about my testing methods. I have a speed stir with my TF-100 kit and when it's dropping in 009 reagent (wiping between drops), there is a transition period between green and slight pink were it's a faint tint of purplish grey. Usually the next drop makes it a very faint pink and the following drop makes it a bright pink (like when adding in 871 to test for FC). My question is at what "phase" do I consider the shift to occur and stop counting drops? It says when turns from green to red, but there is that purplish grey and then faint pink ... should I be going till it's solid pink (no faintness) and stop or should I be stopping at the faint pink and consider that the shift point?
    16,000 gallon 27'x52" Above Ground Pool
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    Butterfly's Avatar
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    Re: Testing TA, when to consider color change complete?

    Here's a link to Extended Test Kit Directions :

    extended-test-kit-directions-t25081.html
    TFP Moderator TF100 Test Kit TF100 TestKit YouTube Channel PoolMath
    You're done SLAMing when:
    1)You lose 1ppm or less FC overnight, & 2)You have .5ppm CC's or less, & 3)your water is clear.

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    Re: Testing TA, when to consider color change complete?

    When you add one more drop and no change occurs, subtract that last drop and what is left is your answer. Make sense?
    Built in 1957 44,000 gallon in-ground, Wet Edge Primera Stone in Sky Blue, Intelliflo VF Pump, 600 lb. Pentair Triton II TR-100 Sand Filter, CircuPool RG 60 Plus SWG, TF-100 test kit
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    FastCougar's Avatar
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    Re: Testing TA, when to consider color change complete?

    Makes perfect sense ... test till color stops changing (once red/pink) ... if that takes 14 drops to get the bright pink and the 15th drop doesn't change it, 14 is the magic number. Thanks again!
    16,000 gallon 27'x52" Above Ground Pool
    Hayward XStream CC1000 Filter w/1HP Pump (hard plumbed)
    My Build Thread

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