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Thread: New Plaster - PH then Alkalinity or Alkalinity then PH Adjustment

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    Join Date
    Mar 2014
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    New Plaster - PH then Alkalinity or Alkalinity then PH Adjustment

    I do understand that PH can fluctuate for around a year while the plaster cures. However, when you lower the PH, you lower the Alkalinity. I have the Stonescapes aggregated plaster and part of the warranty is to not let the PH go above 7.8. When the PH goes to 7.8, I always lower it because sooner, rather than later, it goes to 8.2.

    However, every couple of weeks, the Alkalinity reading drops to below 80. When I adjust that, then I'm tackling an 8.2 PH reading immediately and so the cycle continues.

    Is this how it should be? Get the alkalinity in range, deal with the PH, and then once the alkalinity lowers, do it all over again? Or do I not worry about the alkalinity until the PH finally settles, which could be a year away?

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    JasonLion's Avatar
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    Re: New Plaster - PH then Alkalinity or Alkalinity then PH Adjustment

    If you are in the first month since plaster was applied, just keep the PH in range and let TA take care of it's self. Once it has been a month, you switch to maintaining TA in an appropriate range. That said, is the only reason you are trying to keep TA at 80 because of the warranty? TA down to 60 or 70 is alright by our recommended levels.
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    Re: New Plaster - PH then Alkalinity or Alkalinity then PH Adjustment

    Warranty says alkalinity between 80-120. The pool was replastered in April so we are definitely post 30 days.
    14K IG Aggregate Mini Pebble, 1 HP Hayward Single Speed Pump 120 GPM, 175 Sqft Cartridge Filter
    In-Line Chlorinator, 360 Polaris Black Max, Sheer Descent Water Feature. TF-100 Test Kit
    Build Date 2/1994; Remodel Date 4/2014; Original Owner, North Texas

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    Mod Squad woodyp's Avatar
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    Re: New Plaster - PH then Alkalinity or Alkalinity then PH Adjustment

    PH, PH , PH..........then add add baking soda to raise your TA.
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