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Thread: Low ph in a new fiberglass pool

  1. Back To Top    #1

    Join Date
    Sep 2013

    Question Low ph in a new fiberglass pool

    I have a new indoor pool just opened 3 weeks ago and trying to get the chemistry right after obtaining great advice from the forum.
    I need help with consistently low pH even after adding borax twice while the FC, cya, and TA have reached normal levels.
    I am worried if I can have some sort of algae as I was late about one week in initally adding the chemicals. I am completely inexperienced and have not had a pool before.
    I do not see any green or other color algae but do see some white stuff and not sure if it can be algae or if there are reasons for concern.
    Can it initally take more borax to raise ph or can my low ph be due to algae.
    Thank you for any help / advice.

    Fiberglass indoor pool: 3400 gal covered to control moisture.
    FC: 5 Used liquid chlorine
    CC: 7
    CYA: 25
    TA: 90 used baking soda to raise it
    pH: 7.4 used borax to raise it twice, still low. Did not mix in water but poured granules by weight.

  2. Back To Top    #2

    In the Industry
    duraleigh's Avatar
    Join Date
    Apr 2007
    Sebring, Florida

    Re: Low ph in a new fiberglass pool

    Well, your pH is perfect. Why do you think it is low?

    What IS low is your CYA.

    Your test result of 7 for the cc's is also a trouble spot.

    Tell us what kit you are using to test.
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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