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Thread: Total Alkalinity vs. Adjusted TA

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    Total Alkalinity vs. Adjusted TA

    Can someone explain the importance / difference between TA and the Adjusted TA reading? I can do TA with my kit. Some stores use testing that I believe also reads TA. However at Tex Sun their computerized test comes up with an adjusted TA. There is a measureable difference. Which is correct or more correct? Does it matter? Is there a way to get an adjusted TA other than at this BioGuard store? Thanks

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    Mr Bruce's Avatar
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    Re: Total Alkalinity vs. Adjusted TA

    Adjusted TA takes into account CYA, but the difference is so small we usually ignore it.

    We also usually ignore pool store testing too Waste of time/gas/effort.
    32K gallon Plaster - CircuPool SJ-55 SWG - 1hp Hayward 2 speed Super Pump - Hayward S200 Sand Filter - TF100XL/K-1766
    Test Kits - Pool Math - Chlorine/CYA/Target/Slam Chart - Support TFP

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    Re: Total Alkalinity vs. Adjusted TA

    I'll add just a little to Mr. Bruce's excellent reply.........I would ALWAYS ignore pool store advice and testing......you will be misled.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Total Alkalinity vs. Adjusted TA

    Thank you both. I use pool store testing since they run more tests than my simple test kit. Maybe it's time to upgrade to a more comprehensive testing system?? Any recommendations? The comment on CYA brings up a related question / comment. I read somewhere the CYA should be in the 20 - 50 range. I'm not sure if that's right or depends on where you live, climate, etc. Mine is always around 100. I don't see how it could be much lower as it rains pretty regularly here in Houston and I added quite a bit of water after having the coping inside of the pool bead blasted. And I wonder if I should use unstabilized chlorine tabs instead of stabilized ones? Thanks for the advice!

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    triptyx's Avatar
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    Re: Total Alkalinity vs. Adjusted TA

    The two kits that contain the tests we need you to have to give you the best advice possible are the:

    K-2006C (C gives you extra reagents that you need - the K2006's bottles are teeny tiny) - Available here: K-2006C
    TF-100 (The best value, period) - Available here: TF-100

    Since you already have a small kit that likely contains the OTO Chlorine Test and the pH Test that the TF-100 includes, they now have the TF-50: TF-50 This one has a smaller bottle of the main FAS-DPD test reagent, but again, saves you some cash if you're running short. Just be aware that it has less needed reagents that will force you to refill pretty quickly if you're trying to deal with a pool problem.

    I'd also recommend a Speed-Stir - it greatly eases the effort of testing: Speed Stir
    8,500gal plaster in-ground with attached spa, two floor drains, one skimmer. Chlorine, City Water.
    Pentair WhisperFlo 1hp Pump, MagnaTek Midcentury EPlus motor, Pentair CleanNClear 200SF Cartridge filter, Purex Triton MiniMax 250 Gas Heater, Pentair SunLite, AutoFill.
    Kreepy Krauly Cruiser, TF-100 with SpeedStir. :D

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    Re: Total Alkalinity vs. Adjusted TA

    Thank you. Learning more all the time

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