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Thread: Working on lowering TA - question regarding 'happy PH'

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    Join Date
    Apr 2015
    Location
    Niskayuna, NY
    Posts
    63

    Working on lowering TA - question regarding 'happy PH'

    New pool owner. I just recently made my final payment to the pool builder.

    Here are my test results from this morning:

    FC = 5.5
    CC < 0.5
    PH = 7.8
    TA = 170
    CH = 150 (based on previous test results)
    CYA = 50 (assumed based on previous result of 40 and then I added 2lbs a few days ago)

    I have been mildly working on bring down the TA by adding muriatic acid. I've been adding 3 cups of acid every few days. I don't usually test right after adding because I usually test first and then add acid. When I test again in a couple of days, I almost always have a PH of 7.8. I am aerating through use of SWG, returns pointed toward the surface and I have aerators installed in the return jets on the stairs. TA has not dropped measurably - I've been adding acid a couple of times a week. Is the PH always 7.8 because it rapidly returns to that PH due to the aeration? Should I expect the PH to continue to rise? It seems to get to 7.8 and stay there. I don't think that this is a big deal, but I'm curious because the recommended method for dropping the TA doesn't really seem to be working.

    How often do people add acid while in the process. I suppose that I need to be more aggressive with the acid addition and sampling. Correct.

    I also want to raise up the CYA some more, but I need to get to the store for more stabilizer.
    18x36, 21,000 gallon, in-ground, vinyl, Pentair SWG, DE filter, Pentair 250K Heater, Taylor K-2006, Dolphin Triton

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    Mod Squad JohnT's Avatar
    Join Date
    Apr 2007
    Location
    SW Indiana
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    Re: Working on lowering TA - question regarding 'happy PH'

    Adding 3 cups of acid would only lower your pH to a little over 7.5. The recommended method has you drop your pH down to about 7 and then aerate. It might take more than a gallon of muriatic acid to lower your pool to the area where you can get TA reduction. Unless you get your pH down in the 7-7.2 area, you aren't going to lower your TA because at higher pH there is very little carbon dioxide in the water to get rid of through aeration.
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

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    Join Date
    Apr 2015
    Location
    Niskayuna, NY
    Posts
    63

    Re: Working on lowering TA - question regarding 'happy PH'

    Thanks for the explanation!
    18x36, 21,000 gallon, in-ground, vinyl, Pentair SWG, DE filter, Pentair 250K Heater, Taylor K-2006, Dolphin Triton

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