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Thread: How do I slow fast rising pH

  1. Back To Top    #1

    Join Date
    May 2012
    Brevard Co., FL

    How do I slow fast rising pH

    I have been struggling with keeping my pH from rising quickly. I can lower it with MA to 7.4 and then within a couple of days it is back to 8.0. I am told that new plaster pools have this issue.

    This morning around 7 am the pH was at 7.4 and this evening at 7 pm it was already back up to 7.8.

    Is there anyway to slow this down so I only have to add MA once per week? or even twice per week instead of daily?

    The latest readings were:

    FC= 4 CC = 0 pH=7.8 Acid Demand =1 TA=70 CH=390 CYA=60.
    12000 GAL Total Pool & Spa-1000 GAL Spa/IG/Exposed aggregate/Cartridge CC200/Pentair VS-3050 (174 GPM max.)/SWG-Pentair Intellichlor IC-40/Pentair EasyTouch4/ "The Pool Cleaner"/Screened Enclosure/ Taylor K-2006C Test Kit.

  2. Back To Top    #2
    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Tucson, AZ

    Re: How do I slow fast rising pH

    Not too much you can do.
    All to these cause the pH to rise: aeration (waterfall / spa overflow), SWG, high TA

    You could try keeping the TA a little lower, and maybe adding borates, but that is about all you can do.
    Jason, TFP Moderator
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  3. Back To Top    #3
    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: How do I slow fast rising pH

    It is completely normal for a new plaster pool to require acid additions daily for the first three to four weeks, and very little you can do about it. After that initial period the rate of PH increase will slow dramatically. PH increases will continue at the lower rate for about a year and then go away once the plaster finally finishes curing.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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