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Thread: TA test question

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    TA test question

    I have noticed that when I perform the TA test. The color may change for a brief second from Green to pink but it takes another 2 drops before the change becomes permanent. So I record the amount to make the change permanent. I am doing the right thing?
    I ask because I went for a water check at the local Leslie's pool. They told me that my TA is 50. When I repeat the same test with my kit, I do see this brief color change at 50 as described above but the color change only becomes permanent at 70.
    Who is right?

    Thanks
    Plaster pool, 28,000 gallons (est.), Spa with overspill, Hayward DE filter (72sqft), 1 1/2 HP Sta-rite Dura-Glas II pump, Booster pump and sweeper.

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    Guest

    Re: TA test question

    Leslies is doing it wrong... no surprise here. Continue to titrate until one more drop does not produce any further color change and then do not count that last drop.

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    Join Date
    Mar 2009
    Location
    Woods of North Florida
    Posts
    148

    Re: TA test question

    That is the same thing I was wondering! Is it the same for all tests? Thanks!
    24' Seaspray Evolution CLX Above Ground Pool (~13600 gallons)
    Pentair Sand Dollar SD60 / 22.5" filter / Maximum Flow Rate 60 GPM
    Pentair Dynamo Pump 1 1/2 HP

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    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,887

    Re: TA test question

    Yes, all of the titration tests (add one drop at a time till the color changes) work that way.
    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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    Guest

    Re: TA test question

    All the common ones used in pools. The salt titration test and the borate titration test are slightly different and a bit moe complicated since have endpoints at the first stable color change and can be overtitrated easily. This is one of the main reasons that we recommend strips for these two tests (and because the strips give results that are quite precise for the salt and within the precision needed for the borates.)

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