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Thread: SWG and TA

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    SWG and TA

    I've recently installed a SWG, and I'm still sorting out some questions (I just posted another thread on testing and cold water).

    I read here that TA should be between 60 - 80 with the note that "this is important". For as long as I can remember, my water's TA has been around 120. If memory serves, I need to lower PH to 7 with acid and then increase PH with aeration to lower TA.

    1. Why is a lower TA so important?
    2. Do I need to lower TA using the acid/aeration method? Is that the only method?
    3. I get a lot of PH rise...will lowering TA stabilize my PH?



  2. Back To Top    #2
    Mod Squad JohnT's Avatar
    Join Date
    Apr 2007
    SW Indiana

    Re: SWG and TA

    The biggest reason for lower TA levels in a SWCG pool is that it helps stabilize pH at lower levels and reduces acid demand.

    Acid followed by aeration is the only way to lower TA without it rebounding. The acid additions you make for your SWCG are going to keep lowering the TA slowly over a longer time period. If you want to rush it, do the aeration and then hit it with acid again and repeat to ratchet the TA down.
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
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    Re: SWG and TA

    Thank you John...very helpful!


    IG plaster pool; 14,800 gallons; Hayward 48 sqft DE bump filter; 1hp hayward super pump, polaris 9300 cleaning robot

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    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Tucson, AZ

    Re: SWG and TA

    This process is described in Pool School here: Lower Total Alkalinity

    Like John said, there is not hurry to do this as just normally maintaining the pH in range should bring the TA down.
    What is your top-off water's TA? If that is high, then you will unfortunately always be dealing with the faster rise of the pH due to higher TA.
    Jason, TFP Moderator
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  5. Back To Top    #5

    Re: SWG and TA

    Ah, good point top off water does have a similar TA of 120. Might just be something I have to deal with..


    IG plaster pool; 14,800 gallons; Hayward 48 sqft DE bump filter; 1hp hayward super pump, polaris 9300 cleaning robot

  6. Back To Top    #6
    linen's Avatar
    Join Date
    Jul 2010
    Twin Cities, MN

    Re: SWG and TA

    My top off water is much higher than that, so when I add a significant amount I have to use the aeration technique mentioned to get it down.

    I am not sure this was mentioned explicitly above but, the swg itself will tend to drive your ph up. In addition, having high TA can increase the risk for scaling of the swg cell.
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

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