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Thread: High TA

  1. Back To Top    #1

    Join Date
    Aug 2011
    Winnipeg, Manitoba, Canada

    High TA

    Hi all,

    I'm pretty new to pool ownership - we just had ours put in in early August. The company that sold me the pool set me up with a lot of products - Dazzle "Pure and Simple" is the's kind of confusing. Everything is prominently branded Dazzle and "Pure + Simple" but there's not a lot of info as to what's in the containers. Even the pool company got confused because I had a UV light and that meant I should be using some different flavour of Dazzle. make a long story a little less long...

    The last test I had done at the pool store (Aug 23):

    73800 L / 19500 Gal In-Ground, Vinyl lined

    TC: 5
    FC: 5
    pH: 7.6 (Target 7.4-7.6)
    CYA: 80 (Target 30-50)
    TA: 140
    Adj TA: 114 (Target 125-150)
    Ca: 232 (Target 175-225)
    Borate: 31

    They recommended I add 3.5 Kg of Dazzle TA+
    Up until last week I was chlorinating with Dazzle Tri-chlor sticks.

    I came back from a short trip to Minneapolis with a TF-100 test kit. My wife's aunt was supposed to throw a couple of sticks in the skimmer while we were away, but she didn't and we got a couple of inches of rain, and things were pretty murky when I got back. Reading 0 Chlorine in the pool. I hadn't opened the TF-100 yet, but threw in a couple of bags of the Dazzle weekly shock/oxidizer (not chlorine, but it doesn't really say what it is - safe to swim after 15 minutes apparently). It was Labour Day so I couldn't buy any bleach so just added 3 sticks to the skimmer - which didn't do anything for the chlorine levels in the pool.

    I got out the TF-100 and ran the numbers through the pool calc last Tuesday, bought a bunch of bleach and got the pool up to shock level quickly by adding 20 L of 4% bleach. Everything cleared up quickly and looks great, but my TA seems really high. Here are my numbers as of Friday night (Sept 9).

    FC 10
    CC 0
    TA: 225
    CYA 45
    pH 7.5
    CH 220
    Borate 30

    So everything looks good except TA and CH seem too high. I've run the CYA test twice over a couple of days last week and I'm pretty sure it's right between 40 and 50 using the black dot test.

    Do I need to do something about the high TA? I've got a waterfall and waterslide, so I could lower pH with acid and bring it back up with aeration, but is it necessary? We're getting down to the end of the season here...probably winterizing before the end of the month...any ideas?

    Attached Images Attached Images
    19,500 gal., IG vinyl, Max-E-Pro 1/2hp pump, 300 sqft cartridge filter (50-100 gpm), Trident Series 2 UV system (52 gpm)

  2. Back To Top    #2
    Richard320's Avatar
    Join Date
    Jan 2010
    San Dimas, CA (LA County)

    Re: High TA

    Just maintain pH and the TA will come down all by itself, slowly.

    And when it starts raining in the pool, TA will also drop via dilution.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

  3. Back To Top    #3

    Re: High TA

    You have two things to be really happy about. One the pool store was wrong about the high cya and two you found TFP before your cya was too high. Just currious, is the 4% bleach a Canadian thing?
    10,800 gallons Gunite/Plaster
    Hayward 244t 24" Sand Filter with Zeo
    1 1/2 HP Challenger
    Digital Pool Pilot DIG-220 SC-48
    Located in NOLA

  4. Back To Top    #4

    Join Date
    Aug 2011
    Winnipeg, Manitoba, Canada

    Re: High TA

    Thanks for the replies...I'll keep an eye on the pH and not worry about it too much.

    As for the 4% bleach, well, I never thought to look at the concentration before I found this site. The 4% is the standard-strength Walmart brand "Great Value". They list an Ultra version of the Great Value bleach on their Canadian website that's 6%, but I couldn't find it in-store.
    19,500 gal., IG vinyl, Max-E-Pro 1/2hp pump, 300 sqft cartridge filter (50-100 gpm), Trident Series 2 UV system (52 gpm)

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