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Thread: Strange TA test

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    Strange TA test

    Hi everyone,

    I ran my first complete test today with the TF100. Everything looked good for a pool still shut down. But I was unable to get a TA result. I didnt get a green color when I added 5 drops of R-0008. It was more of a blue. I decided the blue was the color I was looking for, and titrated the R-0009, but after 25 drops, decided to stop. Was my TA really above 250?!

    I came inside and ran the test on some tap water and got a result of 60. So what I am thinking is that my TA is actually very very low, and not registering. The blue color I saw was the blue color of the R-0008 solution.

    Another question. When I am doing this, am I wanting the solution to change completely clear from green and stay clear? When I tested the tap water, after 6 drops it flashed clear when the drop hit the water, but went back green. Even after 10 drops, it was still flashing clear and going back green. So do I want it to hold clear, or count drops until it flashes clear?

    Thanks!

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    Re: Strange TA test

    High chlorine or bromine levels will cause the type of interference you are describing. The test usually goes from green to red, but high chlorine will cause the test to go from blue to yellow.

    Try waiting for the chlorine or bromine to go below 10 ppm or try adding 3 drops of reagent R-0007 before the test. It's also important to swirl the sample thoroughly between drops. Some people find that using a speed stir is helpful.

    What are your other levels?

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    Re: Strange TA test

    Thanks for the advice. I am going to test again tomorrow, because I think I read something wrong. I am using a speed stir. TC was 1-2, PH was <6.8. But the water temp is still 57F, and the pump has not ran all winter. I have been adding bleach periodically just to prevent any growth as the weather has been unusually warm. I plan on taking the cover off and cleaning and opening it this weekend. I am suspecting that my TA is actually low.

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    Re: Strange TA test

    Turn on your pump and let it thoroughly mix your pool water before you tyest again.

    If your pH still registers below 6.8, bring that up right away using 20 mule team borax until you get it in the 7's.

    After your pH is corrected into the mid 7's then you can address TA.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Mod Squad Bama Rambler's Avatar
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    Re: Strange TA test

    If your TA is really low then your pH will be very low.

    I hate to contradict Dave but if your TA really is low, you need to add baking soda first to get it up some and then test and adjust your pH.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    Re: Strange TA test

    Good catch, bama!

    (my associates in the black sedan are outside your home and wish to speak with you)
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Strange TA test

    The TA test normally goes from green to red, but when the chlorine level is high then it goes from blue to yellow. It is not supposed to go to clear. You can add more R-0007 (thiosulfate) to your sample to avoid this interference or you can just note the blue/yellow transition.

    If the TA test initially shows red (or yellow), then that implies a pH of 4.5 or lower. In your case, you start out with blue and you never seemed to get to yellow, but then again you weren't looking for that.
    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
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

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    JasonLion's Avatar
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    Re: Strange TA test

    You are primarily watching for a color change, more than any specific color. Some of the non-Taylor tests will go clear at the end when the FC level is high.
    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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