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Thread: Can't stabilize PH

  1. Back To Top    #1

    Join Date
    Jun 2007
    San Antonio, TX

    Can't stabilize PH

    I have been using the BBB method for several years with great results, however this year I can't seeem to regulate my PH. My pool is 12,000 gal, inground, plaster, Haywood cartridge filter.

    Readings using drops based test kit are as follows:
    FC = 5.0
    CC = 0
    PH = 7.8
    TA = 100
    CA = 750 ( I know it's very high, but refill water is 400, so it has always been high)
    CYA = 50
    TEMP = 84 degrees

    PH will rise about .2 ppm per day. Last year and the years prior to that, one gallon of acid would last me more than a full season. I have already been through 3 gallons this year between the lowering of TA last month (low PH and aeration method) and PH regulation. I thought that lowering my TA from 140 would make a big difference, but it didn't.

    Don't know whether this has any effect, but pool is 12 years old, plaster is quite rough and will probably be replastered after closing this year. I am totally stumped as to why PH is such a pain.

    San Antonio
    10K Plaster Pool
    Haywood Cartridge Filter
    2 Speed 3/4 HP Pump
    Spillover Spa
    Using BBB Method

  2. Back To Top    #2
    Kinguni's Avatar
    Join Date
    Apr 2007
    Winnipeg, Canada

    Re: Can't stabilize PH

    You need to lower your TA even more. I found last year that at a TA of 70 I was able to maintain a pH of 7.5 - 7.6 using bleach as my source of chlorine.

  3. Back To Top    #3

    Re: Can't stabilize PH

    get your TA down and try and maintain the pH between a narrow window of 7.6-7.8

  4. Back To Top    #4

    In the Industry

    Join Date
    Jul 2008

    Re: Can't stabilize PH

    You could use a water softener to reduce the calcium in the water. Any local service will rent you a setup. Run your water through the softener until the calcium is where you want it. Recheck all of your chemicals and rebalance. Use a water softener to control the calcium in the fill water as well. This should help keep things right. The high calcium is causing scale, which causes your walls to be rough.

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