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Thread: Replaster Start-Up - Total Alkalinity Spiked

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    Replaster Start-Up - Total Alkalinity Spiked

    I had my pool & spa replasted last Tuesday with Pebble Fina. The in-water acid wash was done Thursday / Friday. Since then PH and TA were fairly stable (7.4 / 120). The pool company is doing 5 day start-up maintenance, they brush and test the water once daily. I take full maintenance back on Friday.

    Here is what is going on:

    Monday:
    pH: 7.4
    TA: 120

    Tues:
    pH: 7.6 (1/4 gallon acid added)
    TA: 130
    The pool guy wanted to do the Acid Slug method to get the TA down, but I showed him the Lower Total Alkalinity article so he agreed not to. Instead I started Aeration with the spa jets and spa spillway (with the Intelliflo VS running on speed 4).

    Wed:
    pH: 7.6 (1/4 gallon acid added)
    TA: 200

    Based on the Lower Total Alkalinity article, I expected to see the TA drift lower with Aeration, but it jumped to 200, could this just be a normal start-up situation (although I thought start-up led to spikes in PH not TA) or is something else going on?

    The rest of the chemical readings look like this:
    CH: 400 (tested Saturday)
    FC: 0 (recommended to not add chlorine until PH / TA are stable)
    CC: 0 (recommended to not add chlorine until PH / TA are stable)
    CYA: 0 (recommended to not add chlorine until PH / TA are stable)

    I may need to add more acid at a time, the tech did not want to drop the PH to low and chance etching the new plaster.

    Thanks in advance for your advice
    IG 11,000 gallon 14'x30' Freeform Gunite Pool w/ 8' Spillover Spa, Pebble Fina Bella Blue Plaster, Pentair IntelliFlo VS Pump, Quad 80 w/ Fiber Clear Filter, Mastertemp 400HD Heater, IntelliTouch i5+3 w/ ScreenLogic App Controller, IntelliChlor IC40 Salt Cell, IntelliChem PH & ORP Controller w/ Acid Dispenser, IntelliBrite 5g Color Lights, Infusion Venturi Returns

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    Melt In The Sun's Avatar
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    Re: Replaster Start-Up - Total Alkalinity Spiked

    TA and CH will rise quickly at the beginning, and will continue to go up noticably for about a year. I think you need FC now! The pool will be a swamp long before the pH and TA stabilize.
    11,200 gal, Pebble-Tec; Tristar 2-speed 1hp - Swimclear 325 ft2 cart - SWG - A & A in-floor cleaner - Heat pump. For the poolside cooking, a Yoder Wichita and a Big Steel Keg!
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    Re: Replaster Start-Up - Total Alkalinity Spiked

    Thanks, I'll get the chlorine going.

    Do you know why the TA would spike right after I started Aeration? Seems more than a coincidence since PH did not go up?
    IG 11,000 gallon 14'x30' Freeform Gunite Pool w/ 8' Spillover Spa, Pebble Fina Bella Blue Plaster, Pentair IntelliFlo VS Pump, Quad 80 w/ Fiber Clear Filter, Mastertemp 400HD Heater, IntelliTouch i5+3 w/ ScreenLogic App Controller, IntelliChlor IC40 Salt Cell, IntelliChem PH & ORP Controller w/ Acid Dispenser, IntelliBrite 5g Color Lights, Infusion Venturi Returns

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    Mod Squad jblizzle's Avatar
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    Re: Replaster Start-Up - Total Alkalinity Spiked

    I think the spike was a coincidence based on the plaster not the aeration.

    Re-read the article. The aeration does not LOWER the TA. The acid lowers the pH and TA. The aeration RAISES the pH.

    If the acid was not dosed to lower the pH to 7.2 or so, it may not have pulled the TA down much to counter the rise due to the plaster.
    Jason, TFP Moderator
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