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Thread: TA & Aeration

  1. Back To Top    #1

    Join Date
    Mar 2016
    Location
    Medford, Oregon
    Posts
    179

    Question TA & Aeration

    A curiosity question. With a high pH & high TA reading, I added the appropriate amount of muriatic acid & aerated my spa. If I understand correctly, the acid will decrease the pH level & the aeration will lower the level of TA. For a 2,250 gallon in-ground spa, approxiately how long should the blower be on in order to lower the TA level from 110ppm to 80ppm? Thank you kindly.

    Kit
    Kit
    14' X 11' rectangular in-ground spa; 2,360 gals; plaster/gunite; SWCG (Pentair IntelliChlor); Pentair Intelliflo varaible-speed pump; EasyTouch4 control system; cartridge filters; auto cover

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    Mod Squad Jimrahbe's Avatar
    Join Date
    Jul 2014
    Location
    Bedford, TX
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    5,279

    Re: TA & Aeration

    Well... almost.. The acid lowers both pH and TA. Aeration then raises pH and has little effect on TA. But this is not a one time deal. You need to lower pH to about 7.0 and then measure TA and begin to aerate. In an hour or so you measure pH again and when pH gets back to 7.3 or 7.4 you again add acid to bring pH down to 7.0. Measure TA and continue to repeat every hour or so until you get your TA down to what you want. In my case, I bring TA down to about 60. It quickly moves back up to 70 or so and then slowly creeps up to the point where I have to do it all again.

    Jim R.
    Finished in 2015 - 17K Gal, IG, 20' x 25' Almost Rectangular Pool, Pebble finish, three rockport water falls. Pentair Equipment: EasyTouch 4, IC40 SWG, 3 HP VS Pump, CCP520 Cartridge Filter.
    TF100 with SpeedStir and SampleSizer, ColorQ Pro 7, Dolphin Premier Robot Cleaner, added Screen Logic 2, added small 3 person Calder Spa.

  3. Back To Top    #3

    Join Date
    Mar 2016
    Location
    Medford, Oregon
    Posts
    179

    Re: TA & Aeration

    Thanks, Jim. I will give your suggestion a try.

    Kit
    Kit
    14' X 11' rectangular in-ground spa; 2,360 gals; plaster/gunite; SWCG (Pentair IntelliChlor); Pentair Intelliflo varaible-speed pump; EasyTouch4 control system; cartridge filters; auto cover

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