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Thread: TA suddenly dropping...

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    Join Date
    Jun 2013
    Location
    central texas
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    27

    TA suddenly dropping...

    We have a 14 month old pool and I have been successfully doing BBB approximately 11 months. Up until about a month ago TA was relatively stable around 100. In 10 months I probably added baking soda 2-3 times. Also until a month ago, PH was constantly rising to where I needed to add MA every 2-3 days. Suddenly PH was more stable and TA began dropping. At one point it dropped to 10. Now, I'll raise TA up to 110ish and it drops to 60 in 4 days. PH is back to rising fast...

    What is up?

    FC 3
    PH 7.4
    TA 60 (100 on Saturday)
    CH 350
    CYA 40
    19,700 gallons non SWG
    Pentair DE quad 100 filter
    Auto chlorinator and nature 2
    Inground pebble
    Intelliflo variable speed 3 HP pump

  2. Back To Top    #2
    pwrstrk's Avatar
    Join Date
    Aug 2012
    Location
    Elverson Pa.
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    4,758

    Re: TA suddenly dropping...

    Have you've been topping pool off ? What's the TA of your fill water ? 😎
    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

  3. Back To Top    #3

    Join Date
    Jun 2013
    Location
    central texas
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    27

    Re: TA suddenly dropping...

    It auto fills...

  4. Back To Top    #4

    Join Date
    Jun 2013
    Location
    central texas
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    Re: TA suddenly dropping...

    I just tested tap water... TA=140

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    Re: TA suddenly dropping...

    Are you using trichlor tabs?

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    Join Date
    Jun 2013
    Location
    central texas
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    Re: TA suddenly dropping...

    No I'm doing BBB...

  7. Back To Top    #7

    Re: TA suddenly dropping...

    Dropping TA has to be from added acid, or something acidic.

    How much acid have you added?

    What are you lowering the pH to when adding acid?

  8. Back To Top    #8

    Join Date
    Jun 2013
    Location
    central texas
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    27

    Re: TA suddenly dropping...

    I try to keep it between 7.8 and 7.4. I usually add around 30 ounces every 2-3 days. I used to measure it out but lately I have just estimated. I'll start doing everything by the book until I figure what's going on...

  9. Back To Top    #9

    Re: TA suddenly dropping...

    Try keeping the pH at about 7.8. At 7.9, lower the pH to 7.8, and not lower. Keep the TA wherever it needs to be to keep the pH at 7.8.

    If the pH rises above 7.8, lowering it to 7.8 will slightly lower the TA and eventually stop all/most pH rise.

    If the pH keeps going below 7.8, then slightly raise the TA until the pH stabilizes at 7.8.

    If the pH is holding steady at 7.8, then leave the TA where it is.

    What is the water temperature?

  10. Back To Top    #10
    Patrick_B's Avatar
    Join Date
    Jun 2011
    Location
    Midland TX
    Posts
    15,001

    Re: TA suddenly dropping...

    If you have high TA fill water such as yours, there really should never be a need for baking soda. James is correct, you must add something acid to break down TA, so you were pushing the pH down too far too often to break down the TA like that.
    TFP Moderator
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