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Thread: Question on TA

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    Join Date
    Jul 2012
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    Question on TA

    I have an in ground pool with SWG and more recently a pHtek automated acid system. Prior to the pHtek I always had an issue with high pH and high TA thanks to the SWG. After the pHtek was installed the pH has always been spot on. I also have a waterfall, so the addition of acid and aeration also kept the TA where I want it.
    Recently however the TA has taken a nose dive down to 20, vs my target of 70. Now I'm looking at adding Soda Ash to get that back in line.
    Is this common or do I have an issue I need for remedy? It seems counter intuitive to add both acid and soda ash.
    Thanks in advance for any advice.
    12,000gal Venetian glass tile. 4 Pentair Whisperflow (2x1HP, 2x1.5Hp), 1xPentair Waterfall pump (1HP), Triton II sand filter, MiniMax NT 400 heater, PC2000 in floor cleaner, Resilience A5 SWG, pHtek automated acid system, Paramount Clear O3 Ozne Generator.

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    JasonLion's Avatar
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    Re: Question on TA

    When you are constantly feeding acid, the TA will go down steadily over time. When the TA gets too low, the PH will drop and PH regulation will be lost. You need to monitor your TA and make sure it never falls below about 60 to 70.

    You should not be adding soda ash. Soda ash will raise the PH a lot, and raise the TA only a little. You want to add baking soda, which will raise the TA a lot, and raise the PH only a tiny bit.
    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

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    Re: Question on TA

    Thanks.
    I do have Borax in the pool which I believe helps to stabilize also? Do you recommend that?
    12,000gal Venetian glass tile. 4 Pentair Whisperflow (2x1HP, 2x1.5Hp), 1xPentair Waterfall pump (1HP), Triton II sand filter, MiniMax NT 400 heater, PC2000 in floor cleaner, Resilience A5 SWG, pHtek automated acid system, Paramount Clear O3 Ozne Generator.

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    Mod Squad jblizzle's Avatar
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    Re: Question on TA

    Adding borates (using borax) is optional, but it does help to stabilize the pH some and slow how fast the pH rises.

    Regardless, you still need to maintain the TA as Jason described above.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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  5. Back To Top    #5

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    Re: Question on TA

    How do i figure out how much baking soda? I'm trying to raise 12000gal from 20 to 70 TA.
    12,000gal Venetian glass tile. 4 Pentair Whisperflow (2x1HP, 2x1.5Hp), 1xPentair Waterfall pump (1HP), Triton II sand filter, MiniMax NT 400 heater, PC2000 in floor cleaner, Resilience A5 SWG, pHtek automated acid system, Paramount Clear O3 Ozne Generator.

  6. Back To Top    #6
    Mod Squad jblizzle's Avatar
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    Re: Question on TA

    You start using PoolMath
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
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  7. Back To Top    #7

    Re: Question on TA

    Poolmath will do the calculation for you. Enter your pool size and the now and target values. Also, I suspect that you're trying to keep the pH too low. Try keeping it closer to 7.8.

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    Re: Question on TA

    Pool math worked great. Thanks.
    12,000gal Venetian glass tile. 4 Pentair Whisperflow (2x1HP, 2x1.5Hp), 1xPentair Waterfall pump (1HP), Triton II sand filter, MiniMax NT 400 heater, PC2000 in floor cleaner, Resilience A5 SWG, pHtek automated acid system, Paramount Clear O3 Ozne Generator.

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