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Thread: Problem with the T/A

  1. Back To Top    #1

    Join Date
    Jul 2007
    Location
    Michigan,
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    Problem with the T/A

    Hi everyone, my friend,s pool is a little green and I told him to add 3 OR 4 of gallons of bleach and test for all the relevant results, he gave me his test results but could not get any reading for his T/A and when I went up with my test kit I could not get anything either I adhered to the correct amounts and from the green it just went to a whitish colour all with 40 drops of the reagent.
    What gives with the T/A ?
    His other results are as follows
    fc-21
    cc-1
    tc-21
    ph7.4
    CYA-90
    his pool is vinyl with 18,000 gals
    Regards D/B
    14500 gl, oval, vinyl

  2. Back To Top    #2
    AnnaK's Avatar
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    Re: Problem with the T/A

    My best guess is that you don't have any TA in there to test for.

    You could try this experiment: fill the TA cylinder with the required 25 ml of pool water. Add a tiny speck of baking soda. Then do the test per instructions. Go with just one drop at a time with the titrant. You'll have just a little alkalinity and won't need very many drops to effect a colour change from green to hot pink.

    Please let us know if that worked.
    — AnnaK —

    12,000 gal AGP, Hayward sand filter, Pentair 2-speed pump, timer.
    Please visit our Pool Issues pages for information about step weights, managing the solar cover, and PoolSkim.

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    frustratedpoolmom's Avatar
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    Re: Problem with the T/A

    Quote Originally Posted by AnnaK
    My best guess is that you don't have any TA in there to test for.

    You could try this experiment: fill the TA cylinder with the required 25 ml of pool water. Add a tiny speck of baking soda. Then do the test per instructions. Go with just one drop at a time with the titrant. You'll have just a little alkalinity and won't need very many drops to effect a colour change from green to hot pink.

    Please let us know if that worked.
    Great idea, had me stumped. He could test his tap water too, right?
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

  4. Back To Top    #4
    AnnaK's Avatar
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    Re: Problem with the T/A

    Sure. It's always a good idea to run a full test set on the fill water and record it in the pool log.

    But in this case, testing the fill water is not giving us any useful information. If the fill water has no measurable alkalinity we haven't learned anything to help us with the pool water problem. And if it does, it clearly is way too low to make any difference to the pool water.
    — AnnaK —

    12,000 gal AGP, Hayward sand filter, Pentair 2-speed pump, timer.
    Please visit our Pool Issues pages for information about step weights, managing the solar cover, and PoolSkim.

  5. Back To Top    #5

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    San Rafael, CA USA
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    Re: Problem with the T/A

    There's definitely TA in the water. If there wasn't, it would either be very low in pH and be red in the TA test immediately or adding just one drop would have it go from green to red as with distilled water. The Taylor K-2006 instructions state the following:

    High halogen level may change indicator reaction from green/red to blue/yellow; to prevent, add thiosulfate prior to testing.

    The chlorine level is high so the above interference may be happening. Perhaps it was in between green and blue to start, though I don't know how a red-yellow would be confused with white. Also, 40 drops is excessively high. Anyway, the suggestions about testing the tap water is a good one. Most tap water has some TA in it, but not usually very much unless it's well water (my tap water has a TA of around 80 ppm).

    Richard
    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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    frustratedpoolmom's Avatar
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    Re: Problem with the T/A

    My tap water from Lake Michigan has a TA of 120.
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

  7. Back To Top    #7
    AnnaK's Avatar
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    Re: Problem with the T/A

    Thank you Richard.

    We use well water. Our pH is 7.5, TA is 80, no copper or iron. Thinking of bottling it
    — AnnaK —

    12,000 gal AGP, Hayward sand filter, Pentair 2-speed pump, timer.
    Please visit our Pool Issues pages for information about step weights, managing the solar cover, and PoolSkim.

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