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Thread: TA and pH Drift Questions

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    epro05's Avatar
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    TA and pH Drift Questions

    I've been using the TFP method since last year with great results. Thank You.

    When I started TFP, my TA was 100 ppm but is now down to 60 ppm, due to aeration/acid addition cycles. I thought as my TA became lower, that I would reach a point where pH would be stable and quit rising (the happy point). But at TA of 60 ppm I still see my pH rising to 8 over a weeks time, and have to add acid about once a week to bring it down. When I do add acid, I usually bring pH down from 8 to 7.2, which lowers TA a bit more. So I expect my TA to continue dropping.

    Questions:

    1. As my TA continues to get lower, due to aeration/acid cycles, will I get to a sufficiently low TA, such that pH won't rise any more (even with aeration continuing)?

    2. My TA is at 60 now. If it keeps dropping, at what point do I need to start adding baking soda to increase it?

    3. Is there an "unhealthy" low point of TA? Or would something lower than 60 ppm be OK as long as I make sure CSI is in the OK zone.

    Here is a picture of my aeration. Currently, any time my pump is running the lions heads and spa fountain are operating as in the picture. I only run the pump an hour or two each day.

    [IMG][/IMG]
    27,500 gallon in ground gunite/plaster (1995). Attached Spa with fountain, spillway, and 2 lion heads streaming into the pool. Hayward pump and AO Smith UST1152 1.5 hp motor (single speed). Hayward 60 sq ft DE Filter (Model DE-6000). Kreepy Krauly cleaner.

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    JasonLion's Avatar
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    Re: TA and pH Drift Questions

    1) Yes, if you could let TA get low enough the PH would stop going up. Unfortunately, you may not be able to allow TA to go low enough.
    2&3) With borates in the water you can let TA go down to 40. Without borates you should not let it go below 60.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    epro05's Avatar
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    Re: TA and pH Drift Questions

    Thanks, that's good info. Appreciate the response.
    27,500 gallon in ground gunite/plaster (1995). Attached Spa with fountain, spillway, and 2 lion heads streaming into the pool. Hayward pump and AO Smith UST1152 1.5 hp motor (single speed). Hayward 60 sq ft DE Filter (Model DE-6000). Kreepy Krauly cleaner.

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    Mod Squad woodyp's Avatar
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    Re: TA and pH Drift Questions

    Heck with the TA. What a gorgeous view!
    16x32x52" Steel Cornelius Miramar AGP Vinyl liner 13,100 gal. Buried 2 ft.
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    epro05's Avatar
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    Re: TA and pH Drift Questions

    Thank you woodyp. Indeed we do enjoy the view.
    27,500 gallon in ground gunite/plaster (1995). Attached Spa with fountain, spillway, and 2 lion heads streaming into the pool. Hayward pump and AO Smith UST1152 1.5 hp motor (single speed). Hayward 60 sq ft DE Filter (Model DE-6000). Kreepy Krauly cleaner.

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    Re: TA and pH Drift Questions

    My pool exhibits similar pH behavior, and I've also let mine TA drop to 60. May have to investigate this borate idea ...
    15k in-ground plaster, Hayward C900 cartridge, 3/4hp single speed pump, Barracuda G2 cleaner, TF-100

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