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Thread: SWG and TA level

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    SWG and TA level

    From the Pool School article:
    > Adjust your Total Alkalinity to 60-80 ppm. (This is IMPORTANT!)

    My TA is 140 - Above ground pool with SWG (14k gal). The rest of the chemistry is good - with the exception that I have not tested CH yet (will do tomorrow). I expect that to be around 280-300 given last season results.

    My understanding is that having a high TA with SWG will result in constantly rising pH which isn't good for the cell - especially with so much calcium in the water, worse as it gets warm.

    I've seen the concept in the forum that the TA range above will help with the rising pH. Last year (first year of the SWG) I had to do a number of acid additions to keep the pH in range. From my logs, I do see that once I got to 80 (from 100) I didn't need any acid (did not have to lower for the last month of the season). So I believe in the concept. The kids like the fountain, too.

    But I'm a lot higher in TA now after topping off at open, and then having a kid step on a hose and drain the pool down to the return.

    Is there a way to calculate how much total acid I need to add in order to get TA down by 60 ppm (14k gal)?

    How much TA rise would I get if I added borates (targeting 30-50ppm)?
    14000 Gal Above ground pool / SWG / Sand

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    duraleigh's Avatar
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    Re: SWG and TA level

    Is there a way to calculate how much total acid I need to add in order to get TA down by 60 ppm (14k gal)?
    Not that I am aware of. Are you trying to follow the "lowering TA" article in Pool School? If so, you lower the pH down to 7.0 - 7.2 and begin aerating. Once the pH rises back up to around 7.8, repeat the process. Then, test your TA and go from there.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
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    PoolESQ's Avatar
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    Re: SWG and TA level

    The Pool School section has an entire article dedicated to lowering TA. http://www.troublefreepool.com/conte...tal-alkalinity
    Replastered 2015: Sunstone Quartz Midnight Blue 16x32 rectangular gunite with in-pool spa....18,000 gallons. Autopilot Total Control System with SWG and acid pump. Pentair Clean & Clear 420. Auto cover. TF-100.

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    Re: SWG and TA level

    Quote Originally Posted by PoolESQ View Post
    The Pool School section has an entire article dedicated to lowering TA. http://www.troublefreepool.com/conte...tal-alkalinity
    I did see that. I was curious if there's any way to estimate the amount of acid to lower TA by 60-70 ppm in a 14k gallon pool.

    I'd like to know how many gallons to buy
    14000 Gal Above ground pool / SWG / Sand

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    Re: SWG and TA level

    I can sympathize. I have 2 choices on fill water. My well TA is 230 and my municipal water is 280. I finally am down to 90 on my TA. I have not topped off my water as I am letting it lower to install my skimmer. I am going to take my TA to 40-50 then install my skimmer and hope when I add water my TA stays under 100
    Lisa
    Intex AG vinyl 15' x 48" 4,300 gallons due to skimmer install, Krystal Clear SF pump combo 2800 GPH, Krystal Clear SWG, Pool Blaster Max vacuum, Hayward thru the wall skimmer, TF 100 test kit with speed stir, K 1766 Taylor salt test, My SLAM Process

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    ned8377's Avatar
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    Re: SWG and TA level

    You can't put but so much MA in the pool at a time. You have to do it gradually over a number of days. It could take a couple of weeks to a month using the aeration technique. That's the only way to raise the PH without raising the TA. Kids in the pool splashing will speed up the aeration process.
    True L 45,000 gal Hayward IG vinyl pool. Hayward Tristar 2.40 THP; 1.5 FRHP/1.60 SF. Hayward Model # S310T2 Sand Filter. Aqua Rite T-15. Aqua Comfort 154,000 BTU Heat Pump. TF-100

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    Re: SWG and TA level

    so, down at the bottom of pool math there is a section "affects of adding chem's"...

    if you put in 128oz/1gal of MA it will drop your TA by 25, so it will take approximately 4 gallons of MA to lower your TA...

    With that said, you CAN NOT dump all 4 gallons in at 1 time, you have to drop ph down then raise and drop ph again, over and over until you get to your TA to the correct level.. if your ph is at 7.8 you can put in 64oz of MA to drop your ph to 7.2, then aerate to bring back to 7.8..
    Pool: Intex 16x32 15000 gal, 2 speed 340042, Pentair CC320 Filter, CircuPool SJ45 Salt System, Intermatic PE653RC; Hot Tub: 650 Gal SWG Megachlor
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