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Thread: TA readings with high FC?

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    JesseWV's Avatar
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    TA readings with high FC?

    I know pH readings are skewed when FC is above 10. Are TA readings also affected?

    Example:

    3/27/14
    FC: 15.5
    CC: 0.5
    pH: 8.4
    TA: 120

    4/8/14
    FC: 5
    CC: 0
    pH: 6.9
    TA: < 30 (turned at 2 drops, slightly pinker at 3)
    16k gal, 28'x3.5', Vinyl A/G, 1hp Pentair Dynamo 2-speed Pump, Hayward S160T Sand Filter, Intermatic HB800RCL Digital Timer, Intex 8110 SWG, TF-100 Test Kit, SpeedStir Author: Jesse's Graphical Pool Testing Log

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    JasonLion's Avatar
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    Re: TA readings with high FC?

    The TA test is fine at high FC levels. The colors it turns will sometimes be a little different, but the results are still valid.
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    JesseWV's Avatar
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    Re: TA readings with high FC?

    In that case I am very puzzled. I did the test twice on 3/27. I was properly wiping the tip on a dampened towel between each drop. It was 12 drops each time. The 13th drop didn't change the color. 11 days later I've somehow lost 75% TA!?

    Quote Originally Posted by JasonLion View Post
    The TA test is fine at high FC levels. The colors it turns will sometimes be a little different, but the results are still valid.
    16k gal, 28'x3.5', Vinyl A/G, 1hp Pentair Dynamo 2-speed Pump, Hayward S160T Sand Filter, Intermatic HB800RCL Digital Timer, Intex 8110 SWG, TF-100 Test Kit, SpeedStir Author: Jesse's Graphical Pool Testing Log

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    JasonLion's Avatar
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    Re: TA readings with high FC?

    Your PH has also come down dramatically. Presumably you added acid to bring down the PH, which will have also lowered the TA level.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    JesseWV's Avatar
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    Re: TA readings with high FC?

    I didn't add any acid. I assumed the high pH was only due to the high FC. Still wondering what happened.

    16k gal, 28'x3.5', Vinyl A/G, 1hp Pentair Dynamo 2-speed Pump, Hayward S160T Sand Filter, Intermatic HB800RCL Digital Timer, Intex 8110 SWG, TF-100 Test Kit, SpeedStir Author: Jesse's Graphical Pool Testing Log

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