Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 7 of 7

Thread: My TA is dropping but the PH remains the same

  1. Back To Top    #1

    My TA is dropping but the PH remains the same

    My TA has dropped from 90 to 80 but my pH has remained steady at 7.5

    Should I be trying at all to bring my TA back up to the 90-100 range or just let it be unless the pH goes down too?
    TFP SUPPORTER through TFTestKits.com - My Pool: South Florida, 11K gallons, In ground, concrete / Diamond Brite, Free Form with attached spa (no heater- go figure) Built around 1998, original surface, Jacuzzi Magnum Force 1.5HP pump, Jacuzzi Cartridge Filter, Rainbow 320 Tablet Feeder, Hayward Navigator Pro, Taylor K-2006 w/ TFTestKits replacemeng Reagents.

  2. Back To Top    #2

    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Location
    Sebring, Florida
    Posts
    30,077

    Re: My TA is dropping but the PH remains the same

    Accuracy on the TA test is +- 10ppm so let it ride until you can make an adjustment you can detect.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  3. Back To Top    #3
    svenpup's Avatar
    Join Date
    Nov 2009
    Location
    Sacramento, CA
    Posts
    835

    Re: My TA is dropping but the PH remains the same

    TA contributes to Calcite Saturation Index (CSI) which is a measure of whether your water is likely to cause scaling, is likely to cause etching, or is balanced. TA can be adjusted to keep your CSI in range (e.g. to offset high CH)

    High TA causes upward pressure on pH. TA can be adjusted to minimize pH drift.

    To answer the question where your TA should be we need a full set of test results, but there is no reason to adjust TA just for the sake of getting it to a certain number.
    TFP Method Advanced Intermediate
    • 17,500 gallons - In Ground - Plaster - Hayward Swimclear 3020 Cartridge Filter - Sta-Rite Max-E-Glas Main Pump upgraded with A.O. Smith B2980 E-Plus New Centurion Two-Speed Motor - Polaris 280 Cleaner with Polaris PB4-60 Booster Pump - TightWatt2 Timer - Taylor K-2006 Test Kit - Pool Pilot Digital Nano SWCG

    Helpful Links: Pool School, BBB for Beginners, How to Shock (hint...it's a process not a product), Chlorine/CYA Chart, Jason's Pool Calculator

  4. Back To Top    #4
    Melt In The Sun's Avatar
    Join Date
    Oct 2009
    Location
    Tucson, AZ
    Posts
    3,899

    Re: My TA is dropping but the PH remains the same

    TA shouldn't drop unless you add acid. Are you using trichlor tabs? I see a tab feeder in your signature. They will slowly drop pH and TA both. As long as pH is stable, I wouldn't change your TA.
    11,200 gal, Pebble-Tec; Tristar 2-speed 1hp - Swimclear 325 ft2 cart - SWG - A & A in-floor cleaner - Heat pump. For the poolside cooking, a Yoder Wichita and a Big Steel Keg!
    TF Test Kits -- PoolMath -- Pool School
    Make each day your masterpiece. - John Wooden

  5. Back To Top    #5

    Re: My TA is dropping but the PH remains the same

    Quote Originally Posted by svenpup
    To answer the question where your TA should be we need a full set of test results, but there is no reason to adjust TA just for the sake of getting it to a certain number.
    FC - 9
    CC - .5
    PH - 7.5
    TA - 80
    CH - 260
    CYA - 75
    TFP SUPPORTER through TFTestKits.com - My Pool: South Florida, 11K gallons, In ground, concrete / Diamond Brite, Free Form with attached spa (no heater- go figure) Built around 1998, original surface, Jacuzzi Magnum Force 1.5HP pump, Jacuzzi Cartridge Filter, Rainbow 320 Tablet Feeder, Hayward Navigator Pro, Taylor K-2006 w/ TFTestKits replacemeng Reagents.

  6. Back To Top    #6
    svenpup's Avatar
    Join Date
    Nov 2009
    Location
    Sacramento, CA
    Posts
    835

    Re: My TA is dropping but the PH remains the same

    Are you still using tablets?
    TFP Method Advanced Intermediate
    • 17,500 gallons - In Ground - Plaster - Hayward Swimclear 3020 Cartridge Filter - Sta-Rite Max-E-Glas Main Pump upgraded with A.O. Smith B2980 E-Plus New Centurion Two-Speed Motor - Polaris 280 Cleaner with Polaris PB4-60 Booster Pump - TightWatt2 Timer - Taylor K-2006 Test Kit - Pool Pilot Digital Nano SWCG

    Helpful Links: Pool School, BBB for Beginners, How to Shock (hint...it's a process not a product), Chlorine/CYA Chart, Jason's Pool Calculator

  7. Back To Top    #7
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: My TA is dropping but the PH remains the same

    Trichlor will constantly lower the PH a fair bit and the TA a little. Something, most likely aeration, is raising the PH back up. However aeration doesn't raise the TA, so TA will fall slowly.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

Posting Permissions

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