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Thread: PH & Base Demand Question

  1. Back To Top    #1

    Join Date
    Aug 2015
    Westchester, NY

    PH & Base Demand Question

    Hi All:

    Somewhat new to pools so please forgive me if this question seems elementary.

    Just had water tested at a local Leslie's and I am showing a 7.8 PH but a "Base Demand" of 4. They are recommending I add 3 lb, 12 oz of Soda Ash to the pool - is that right? Soda Ash raises the ph but I am already at 7.8 (top of the recommended range). Please let me know your thoughts.

    Also, what does it mean that I am showing a 4 Base Demand reading?

    Thanks in advance!

  2. Back To Top    #2
    Mod Squad woodyp's Avatar
    Join Date
    Apr 2010
    East Texas

    Re: PH & Base Demand Question

    Welcome. Soda ash raises PH----I have no idea why they'd recommend that. You have a full set of test results for us to peek at? What is your TA?
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  3. Back To Top    #3

    Join Date
    Aug 2015
    Westchester, NY

    Re: PH & Base Demand Question

    Thank you, woodyp.

    FAC = 2
    TAC = 2
    CH = 210
    CYA = 50
    TA = 60
    ph = 7.8
    Base Demand = 4
    Copper = 0
    Iron = 0
    TDS = 400
    PHO = 0

  4. Back To Top    #4

    Re: PH & Base Demand Question

    They probably meant acid demand. Get your own test kit and post the results.

    Don't add soda ash.

    What are all of your results?

    What chlorine do you use?
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