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Thread: lowering TA in a new pool

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    partypond's Avatar
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    lowering TA in a new pool

    Here are this mornings numbers...

    FC 2.5 (added bleach to get that up to about 5)
    CC 0
    PH 7.8
    TA 140
    CH 550
    CYA 35

    I am trying to lower the TA and added some M acid this morning. The ph is now at 7.2 and I am running the bubbler and fountain. Am I headed in the right direction? How long do I keep the ph at 7.2 or just until TA drops? I am shooting for 100 TA - any guess on how long that should take? Why is it raising? (last week was 100 now 140)

    I know my CH is high - I am hoping as I get all the sand (no landscaping yet but LOTS of sand and wind), and new plaster dust out of the pool it will come down more. I started at 600 last week.

    Any other feed back?

    THANKS!!
    36x16 gunite, 14,500 gallons, Jandy 2.0hp VS Epump, Jandy CL460 filter, Automatic chlorinator, Jandy Legacy 400K BTU Heater, Polaris 1.5HP spa blower, 2 Colorlogic pools lights and 1 Colorlogic spa light, Polaris 3/4HP booster pump, Polaris 280 cleaner, Jandy PS4 with PDA, QuartzScapes Montego Bay plaster, OK flagstone coping, spray deck (aggregate effect) - completed 3/2011

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    JasonLion's Avatar
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    Re: lowering TA in a new pool

    It can take a long time. If your plaster is less than one month old, it can take a very very long time, since the TA goes up as the plaster cures.

    Fresh plaster raises PH, TA, and CH as it cures. This happens quickly for about three or four weeks, longer if the water is very cold. Then it proceeds more slowly for up to a year.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    partypond's Avatar
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    Re: lowering TA in a new pool

    Jason, Thanks for the info!

    Quess I will plan on just keeping the TA about 7.2 for the first month or so and then see from there.

    I think that is the hardest part to new water chemistry is figuring out what your goals should be since every pool is different and so many things are happening when you first get started.
    36x16 gunite, 14,500 gallons, Jandy 2.0hp VS Epump, Jandy CL460 filter, Automatic chlorinator, Jandy Legacy 400K BTU Heater, Polaris 1.5HP spa blower, 2 Colorlogic pools lights and 1 Colorlogic spa light, Polaris 3/4HP booster pump, Polaris 280 cleaner, Jandy PS4 with PDA, QuartzScapes Montego Bay plaster, OK flagstone coping, spray deck (aggregate effect) - completed 3/2011

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    JasonLion's Avatar
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    Re: lowering TA in a new pool

    Yes, it can be intimidating enough for a new pool owner, even without dealing with fresh plaster issues. Plaster pools are noticeably more complicated right at the start, which means even more to learn and more serious consequences if you aren't paying attention.
    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: lowering TA in a new pool

    You can use the pool calculator to calculate your CSI.
    You should keep it slightly negative for the first 30 days to help prevent scaling from the plaster dust.

    Also see these references http://www.npconline.net/StartUp.pdf
    pool-school/pool_plaster_start-up

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    partypond's Avatar
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    Re: lowering TA in a new pool

    update - well I just checked the TA and it is down to 120. The pH rose alittle so added more acid but it looks like it is working just the way Pool School said it would!!

    Thanks for the wise words.
    36x16 gunite, 14,500 gallons, Jandy 2.0hp VS Epump, Jandy CL460 filter, Automatic chlorinator, Jandy Legacy 400K BTU Heater, Polaris 1.5HP spa blower, 2 Colorlogic pools lights and 1 Colorlogic spa light, Polaris 3/4HP booster pump, Polaris 280 cleaner, Jandy PS4 with PDA, QuartzScapes Montego Bay plaster, OK flagstone coping, spray deck (aggregate effect) - completed 3/2011

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