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Thread: Total Alkalinity too low?

  1. Back To Top    #1

    Join Date
    May 2009
    Location
    Seminole, FL
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    71

    Total Alkalinity too low?

    My TF Testkit is showing my TA at about 60. It turns red at 60 and SLIGHTLY more red at 70. So it may be closer to 70. Is this too low? I have to frequently add acid to my pool as my PH rises quite regularly. I'd say I add about 40oz of acid every week. My plaster is a little over a year old. Should I look at increasing it? I thought having it low would keep my PH from rising (It NEVER drops). I'm wondering if I should raise it a bit with some baking soda or will that make my PH rise even worse?

    Thanks.
    ~13000 inground plaster
    150sq Ft Cartridge Filter

  2. Back To Top    #2

    Join Date
    Aug 2010
    Location
    Boston, MA
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    Re: Total Alkalinity too low?

    If the 7th drop changes the color, your reading is 70. Which is the low end of the recommended range, but not outside it. So since you've already got a rising pH issue from the still-fairly-new plaster, and increasing TA will make it rise even faster, I'd say to keep it there. (Assuming your other numbers are nicely balanced.)
    20k gallon IGP
    Plaster over gunite
    3/4 hp Hayward pump
    Purex Triton DE filter
    TF100 test kit w/ speedstir

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    Mod Squad Bama Rambler's Avatar
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    Re: Total Alkalinity too low?

    When doing the test keep dropping until the color quits changing and don't count the last drop if it didn't make the color change. I'd say your TA was 70 or 80+. I wouldn't raise it. Mine runs between 70 and 80 and I rarely add acid. Do you have a swcg?
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    Re: Total Alkalinity too low?

    Quote Originally Posted by Bama Rambler
    When doing the test keep dropping until the color quits changing and don't count the last drop if it didn't make the color change. I'd say your TA was 70 or 80+. I wouldn't raise it. Mine runs between 70 and 80 and I rarely add acid. Do you have a swcg?
    No SWCG.. strickly liquid chlorine. My full numbers:

    TC: 6
    CC: 0
    TA: 60-70 (Probably 70)
    CH: 280
    CYA: 40
    PH 7.8 (Need to add some acid today)
    ~13000 inground plaster
    150sq Ft Cartridge Filter

  5. Back To Top    #5
    Mod Squad Bama Rambler's Avatar
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    SouthWest Alabama
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    Re: Total Alkalinity too low?

    I'd lower the pH and leave everything else alone.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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