Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 10 of 10

Thread: Why is TA rising?

  1. Back To Top    #1

    Join Date
    Oct 2015
    Location
    Orinda, California
    Posts
    56

    Why is TA rising?

    What causes TA to rise? Fill water is 30. My PH from fill water is approximately 8.0 to 8.5. Thanks in advance.

    I get TA down to 70, but keeps rising.
    Last edited by JVTrain; 06-22-2016 at 11:41 AM. Reason: Removed self-quote
    28,000 gallon IG pool, plaster, built approx. 1970.
    1 1/2 " plumbing. Pentair, Intelliflo 3 hp variable speed.
    Crystal Water cartridge filter system, model #425
    Dolphin Deluxe 4,

  2. Back To Top    #2
    Mod Squad JVTrain's Avatar
    Join Date
    Feb 2014
    Location
    Central Minnesota
    Posts
    5,079

    Re: Why is TA rising?

    TA will only rise from a chemical addition. Either from fill water or a product being used in the pool. How are you chlorinating the pool?
    Joel - TFP Moderator - Minnesota - **Become a TFP Supporter!** Helpful Links: ABCs of Pool Water Chemistry - SLAM Procedure - Chlorine/CYA Chart
    40x20 Pool: 32K Gallons * Vinyl * Bleach Chlorination * Hayward S270T Sand Filter * Pentair SuperFlo 1 HP * Teledyne/Laars Heater * AquaVac Tigershark * TF-100 w/ SpeedStir
    Isolated Spa - 345 Gallons

  3. Back To Top    #3

    Join Date
    Oct 2015
    Location
    Orinda, California
    Posts
    56

    Re: Why is TA rising?

    8.25% Clorox. approximately 121 oz every other night.
    28,000 gallon IG pool, plaster, built approx. 1970.
    1 1/2 " plumbing. Pentair, Intelliflo 3 hp variable speed.
    Crystal Water cartridge filter system, model #425
    Dolphin Deluxe 4,

  4. Back To Top    #4

    Join Date
    Oct 2015
    Location
    Orinda, California
    Posts
    56

    Re: Why is TA rising?

    I believe you are saying my TA should stay constant, if one is not adding chemicals. I have to lower PH now as my fill water adds to my existing range of 7.5 to 7.8
    Lower PH by acid.
    28,000 gallon IG pool, plaster, built approx. 1970.
    1 1/2 " plumbing. Pentair, Intelliflo 3 hp variable speed.
    Crystal Water cartridge filter system, model #425
    Dolphin Deluxe 4,

  5. Back To Top    #5
    Mod Squad JVTrain's Avatar
    Join Date
    Feb 2014
    Location
    Central Minnesota
    Posts
    5,079

    Re: Why is TA rising?

    It should stay constant under normal conditions until you add acid. Adding acid always lowers TA.

    Your plaster is old/fully cured, so there is not much reason to believe that you could be leeching alkalinity from your pool surface itself. If you could post a full set of test results, that might be helpful.
    Joel - TFP Moderator - Minnesota - **Become a TFP Supporter!** Helpful Links: ABCs of Pool Water Chemistry - SLAM Procedure - Chlorine/CYA Chart
    40x20 Pool: 32K Gallons * Vinyl * Bleach Chlorination * Hayward S270T Sand Filter * Pentair SuperFlo 1 HP * Teledyne/Laars Heater * AquaVac Tigershark * TF-100 w/ SpeedStir
    Isolated Spa - 345 Gallons

  6. Back To Top    #6

    Join Date
    Oct 2015
    Location
    Orinda, California
    Posts
    56

    Re: Why is TA rising?

    CYA 30 -35, very subjective
    CH - 310
    FC - 6
    CC - 0
    TA 7 goes to 8 in one week after adding fill water in the summer
    PH - 7.5 - 7.8, once rises above 7.8, I lower to 7.4, about once a week

    - - - Updated - - -

    When I add acid to lower PH, TA also gets lowered to 7
    28,000 gallon IG pool, plaster, built approx. 1970.
    1 1/2 " plumbing. Pentair, Intelliflo 3 hp variable speed.
    Crystal Water cartridge filter system, model #425
    Dolphin Deluxe 4,

  7. Back To Top    #7
    mikemass's Avatar
    Join Date
    Jul 2013
    Location
    Northern Howell, NJ
    Posts
    484

    Re: Why is TA rising?

    Quote Originally Posted by TJTJ View Post
    TA 70 goes to 80 in one week after adding fill water in the summer

    When I add acid to lower PH, TA also gets lowered to 70
    Corrected your numbers. I think you are posting drops of R-0009 without multiplying by a factor of 10.
    25 + year pool owner. Current pool (going on 11th year) - 38K gallon in ground Gunite/White Plaster, Spillover Spa, Hayward Cartridge Filter, Hayward 450k BTU NG Heater, Hayward Goldline Aqua Logic control with T-Cell-15 Salt Water Cell, Dolphin Explorer.
    You Need: Bleach, a A Test Kit & a Bookmark to "Pool School". Now what's your question?

  8. Back To Top    #8

    Join Date
    Oct 2015
    Location
    Orinda, California
    Posts
    56

    Re: Why is TA rising?

    You are correct. I meant TA is 70 or 80
    28,000 gallon IG pool, plaster, built approx. 1970.
    1 1/2 " plumbing. Pentair, Intelliflo 3 hp variable speed.
    Crystal Water cartridge filter system, model #425
    Dolphin Deluxe 4,

  9. Back To Top    #9
    Mod Squad JVTrain's Avatar
    Join Date
    Feb 2014
    Location
    Central Minnesota
    Posts
    5,079

    Re: Why is TA rising?

    If your TA is increasing after filling, it has to be coming from your fill water. Have you retested the fill water? Let your source run for several minutes, then collect a sample.
    Joel - TFP Moderator - Minnesota - **Become a TFP Supporter!** Helpful Links: ABCs of Pool Water Chemistry - SLAM Procedure - Chlorine/CYA Chart
    40x20 Pool: 32K Gallons * Vinyl * Bleach Chlorination * Hayward S270T Sand Filter * Pentair SuperFlo 1 HP * Teledyne/Laars Heater * AquaVac Tigershark * TF-100 w/ SpeedStir
    Isolated Spa - 345 Gallons

  10. Back To Top    #10

    Join Date
    Oct 2015
    Location
    Orinda, California
    Posts
    56

    Re: Why is TA rising?

    I tested twice and the results came up TA 30 both times. I didn't let the hose run, almost immediately I filled 3 gallon bucket. Will do as you suggested.
    28,000 gallon IG pool, plaster, built approx. 1970.
    1 1/2 " plumbing. Pentair, Intelliflo 3 hp variable speed.
    Crystal Water cartridge filter system, model #425
    Dolphin Deluxe 4,

Posting Permissions

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