Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 3 of 3

Thread: Lowering TA

  1. Back To Top    #1

    Join Date
    Jun 2008

    Lowering TA

    The last 12 months have been hot and dry. Since our fill water has 217 ppm CaCO3 my TA has been increasing. I want to decrease the TA and add more Borax.

    My current water test results are:
    FC = 4.0
    TC = 4.0
    pH = 7.6
    TA = 170
    CYA = 65
    Borates = 20
    CH = 230
    Salt = 3,400

    The water is crystal clear and sparkling.

    Is the TA lowered by adding acid or does the TA decrease by CO2 leaving the pool during aeration.

    Instead of lowering the TA by adding acid and then aerate to raise the pH to 7.6 can I lower the TA by adding acid and then raise the pH by adding borax?

    30,000 gallon gunite in-ground with a spillover spa, Diving board and water slide
    Hayward 1 HP Super II filter pump, Hayward 24 " Sand Filter Pro Series using zeolite media
    Polaris 380 cleaner with ¾ HP booster pump, Hayward Heatmaster pool heater, AutoPilot DIG-220 Power Supply SC-60 cell
    Testing with the TF-100 Test Kit

  2. Back To Top    #2

    Join Date
    Aug 2010
    Dallas, TX

    Re: Lowering TA

    TA is lowered by the acid, then you bring the pH back up with aeration. If you add borax, it brings the TA back up.
    Built in 1957 44,000 gallon in-ground, Wet Edge Primera Stone in Sky Blue, Intelliflo VF Pump, 600 lb. Pentair Triton II TR-100 Sand Filter, CircuPool RG 60 Plus SWG, TF-100 test kit
    If TFP has helped you, please click to SUPPORT TFP!

  3. Back To Top    #3
    dmanb2b's Avatar
    Join Date
    Apr 2009

    Re: Lowering TA

    You'll also want to reduce TA before bringing the Borate level back up to 50. Borates slow the rate of PH rise from aeration.
    24'x52" AGP (13,500 Gallons), Intex SWG, (2)Solar Bear 4x20 panels, Hayward S220T Filter, 1/2hp Pentair Superflo

    Pool School, TFTestKits, Pool Calculator

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts