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Thread: Why you want higher TA with trichlor tabs?

  1. Back To Top    #1

    Join Date
    Jun 2014
    Fulton, ms

    Why you want higher TA with trichlor tabs?

    These levels will work for most pools most of the time, but are not ideal in all situations. If you are using trichlor tablets for chlorine, follow the bleach recommendations but have TA around 100-150 and be sure it doesn't fall below 100. If you have high TA or high CH fill water, large amounts of aeration, lots of direct sunlight, or fresh plaster you should expect to need adjustments to these recommendations. For advice on what would be ideal for your pool please ask on the forum.
    I was reading the recommended levels and just was curious as to why you want TA to be 100-150 when using trichlor tablets?


  2. Back To Top    #2
    Casey's Avatar
    Join Date
    Apr 2007
    SW PA

    Re: Why you want higher TA with trichlor tabs?

    Because trichlor is acidic and lowers TA and pH considerably with it's use.
    I'd bet you my bikini you'll never get TFP water from a pool store!

    24' Sharkline Venture De Filter

  3. Back To Top    #3
    svenpup's Avatar
    Join Date
    Nov 2009
    Sacramento, CA

    Re: Why you want higher TA with trichlor tabs?

    This is a great example of how at TFP we don't just shoot for some arbitrary range recommended by test strips or pool store. Understanding the effect allows us to adapt to the specifics of our circumstances.

    TA tends to push pH up, so the higher the TA the more tendency for pH rise.

    Tri-chlor pucks are highly acidic and therefore drive down pH and over time reduces TA. In this case it is beneficial to keep TA high since it will slow the effects of the pucks driving pH down.

    Conversely, SWG systems tend to drive pH up due to the aeration they produce. In this case it is beneficial to keep TA low since it will slow the effects of the SWG driving pH up.
    TFP Method Advanced Intermediate
    • 17,500 gallons - In Ground - Plaster - Hayward Swimclear 3020 Cartridge Filter - Sta-Rite Max-E-Glas Main Pump upgraded with A.O. Smith B2980 E-Plus New Centurion Two-Speed Motor - Polaris 280 Cleaner with Polaris PB4-60 Booster Pump - TightWatt2 Timer - Taylor K-2006 Test Kit - Pool Pilot Digital Nano SWCG

    Helpful Links: Pool School, BBB for Beginners, How to Shock ('s a process not a product), Chlorine/CYA Chart, Jason's Pool Calculator

  4. Back To Top    #4

    Re: Why you want higher TA with trichlor tabs?

    If TA gets too low, then pH becomes unstable. If pH crashes, that is goes below the minimum testing range of 6.8, you won't know how low it actually could be. Might be 6.9 or 5 or 4 or 3, you won't know, it all looks like 6.8. At low pH you risk harming metals in the pool equipment. And of course if you are damaging metals, you sure as heck don't want to swim in that!

    In my pool I noticed pH instability at TA of 50 to 60. One time I'd test and pH was lower than normal, then I'd test again and it was higher than normal. I decided that TA > or = 60 was the minimum for my pool. As my tap water has high TA, it is pretty hard to get my pool TA that low but a lot of rainwater and/or use of trichlor can do it. When I go on vacation, if TA is very low I will increase it a bit to compensate for what the trichlor tabs will do to the TA while I am gone. No need to go all the way to 100 but I will move it from 60 up to 80 or 90, should it be that low. I always do test to know so I can do what is needed.
    23,000 gallon in ground pool with rock waterfall and spillover spa, Aqualink control system, Polaris 380 cleaner, Purex Triton Clean&Clear Plus cartridge filter. Located in The Woodlands, Texas.

    Pool owner since Nov 2008, Trouble Free since April 2009. Happy to help when I can.

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