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Thread: Chemistry Question re: High TA

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    Chemistry Question re: High TA

    I have the following readings 4 weeks into startup with addition of high iron hard well water on a weekly basis. Can anyone help me understand if TA is high what I should do differently and if that even matters?
    CC-.5
    FC-2
    TA-180 (rose from start of 100)
    CYA-10
    PH-7.6
    40,000 gallons (20' x 40'); IG; vinyl liner
    sand filter
    BBB method for 2 full seasons
    tf100 test kit
    central Illinois

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    Mod Squad JVTrain's Avatar
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    Re: Chemistry Question re: High TA

    You're having to add water on a weekly basis? If so, have you done the "bucket test" to see if you have a leak?

    If your TA is rising, it has to be coming from an external source, such as your fill water or chemicals. Test your fill water for pH, TA and CH and post those results.
    Joel - TFP Moderator - Minnesota - **Become a TFP Supporter!** Helpful Links: ABCs of Pool Water Chemistry - SLAM Procedure - Chlorine/CYA Chart
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    Re: Chemistry Question re: High TA

    Can you test your well water for pH, TA and CH? Do you know how much iron is in your well water?

    TA only increases for two reasons, your well water has high TA and/or you're adding TA from either baking soda or soda ash. Are you adding TA?
    Matt
    16k IG PebbleTec pool, 650gal spa, spillway and waterfall, 3HP IntelliFlo VS / 1.5HP WhisperFlo, Pentair QuadDE-100 filter, IC40 SWCG, MasterTemp 400k BTU/hr NG heater, KreepyKrauly suction-side cleaner Dolphin S300i robot, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

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    Re: Chemistry Question re: High TA

    Well water is pH 7.2 and TA 360 so very high yes. Does TA really matter?

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    JoyfulNoise's Avatar
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    Re: Chemistry Question re: High TA

    Quote Originally Posted by birkesl View Post
    Well water is pH 7.2 and TA 360 so very high yes. Does TA really matter?
    Yes, it absolutely matters at that level. High TA is the primary contributor to constant pH rise. Your acid demand will be high because of it.

    People who have high TA fill water need to limit evaporation as much as possible. Use of a pool cover is highly recommended. There is an article in Pool School on how to lower TA.
    Matt
    16k IG PebbleTec pool, 650gal spa, spillway and waterfall, 3HP IntelliFlo VS / 1.5HP WhisperFlo, Pentair QuadDE-100 filter, IC40 SWCG, MasterTemp 400k BTU/hr NG heater, KreepyKrauly suction-side cleaner Dolphin S300i robot, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

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    Re: Chemistry Question re: High TA

    Quote Originally Posted by JoyfulNoise View Post
    Yes, it absolutely matters at that level. High TA is the primary contributor to constant pH rise. Your acid demand will be high because of it.

    People who have high TA fill water need to limit evaporation as much as possible. Use of a pool cover is highly recommended. There is an article in Pool School on how to lower TA.
    I will point out that it is less of a concern here in the Midwest than it would be in your neck of the woods since through a large portion of the season we get plenty of rain to keep us topped off. I usually go through 3-4 gallons of MA in the first month of the season and then only 1 more over the rest of the season as I only need to top off a couple of times during the heat of mid Summer.
    JD - 28' Round Above Ground Pool, 17,000 Gallons. Dual speed Jacuzzi pump with cartridge filter. Dual speed 1 HP pump, Hayward S210T sand filter
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    JoyfulNoise's Avatar
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    Re: Chemistry Question re: High TA

    Quote Originally Posted by Donldson View Post
    I will point out that it is less of a concern here in the Midwest than it would be in your neck of the woods since through a large portion of the season we get plenty of rain to keep us topped off. I usually go through 3-4 gallons of MA in the first month of the season and then only 1 more over the rest of the season as I only need to top off a couple of times during the heat of mid Summer.
    That makes sense. By comparison my fill water has low TA (~100ppm or so) but my evaporation rates are a lot higher (100" annually on average). I barely go through 4 gallons of MA over an entire summer (Jun-Aug). So that's a great comparison of how high TA affects acid demand.
    Matt
    16k IG PebbleTec pool, 650gal spa, spillway and waterfall, 3HP IntelliFlo VS / 1.5HP WhisperFlo, Pentair QuadDE-100 filter, IC40 SWCG, MasterTemp 400k BTU/hr NG heater, KreepyKrauly suction-side cleaner Dolphin S300i robot, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

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    Re: Chemistry Question re: High TA

    Yep, for comparison we get about 45" evaporation annually and average 3-4 inches of rainfall per month over the summer, so much more even here. My big TA influx is in the Spring since I drain about 1/3 of my pool to close, leading to over 5000 gallons of 400+ TA fill water. I started with 200 TA this season and it would rise so quickly that I could dose with acid twice a day. It is finally down to 120 and although I am adding acid daily it is much less.

    So to birkesl, yes it is important to mind your TA but as long as you are testing and adjusting your pH daily then it will fall to a more reasonable level. You are just always going to want to keep acid on hand. I can't even recall a time where I have had to raise my pH or TA since switching to liquid chlorine.
    JD - 28' Round Above Ground Pool, 17,000 Gallons. Dual speed Jacuzzi pump with cartridge filter. Dual speed 1 HP pump, Hayward S210T sand filter
    Pool School - PoolMath - HIGHLY Recommended Test Kits

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