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Thread: Can I Lower Ph with Boric Acid?

  1. Back To Top    #1

    Join Date
    Mar 2015
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    Huntington Beach, California
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    Can I Lower Ph with Boric Acid?

    I took the Borate plunge last week using Boric Acid from dudadiesel, new water, and filters.

    This borated water has been the easiest water to maintain than any other water so far. Thanks to everybody on here that contributed to that good recommendation!

    Can I use the leftover Boric Acid to lower Ph? I did not see it on the Pool Calculator in the Ph section, and didn't get any search results.

    My guess, from what I read using it to Borate, that it's not strong enough.

    Thanks!
    2007 Artesian Island Spa, Bahama 52, 2 pump, 450 gallon, Serial# 75777, Build date 2/23/2007, on Bromine and Borates.

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    Patrick_B's Avatar
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    Jun 2011
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    Re: Can I Lower Ph with Boric Acid?

    Use MA instead, save that for later if you need to replenish.
    TFP Moderator
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  3. Back To Top    #3

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    Mar 2015
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    Huntington Beach, California
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    Re: Can I Lower Ph with Boric Acid?

    Thank you!
    2007 Artesian Island Spa, Bahama 52, 2 pump, 450 gallon, Serial# 75777, Build date 2/23/2007, on Bromine and Borates.

  4. Back To Top    #4
    Patrick_B's Avatar
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    Re: Can I Lower Ph with Boric Acid?

    No problem!
    TFP Moderator
    Essential Links:
    ABC's Of Pool Chemistry, Test Kits, SLAM Your Pool
    28K Gal IG FreeForm, CLI Quartz, Pentair 36"SF & VS Pump, Dolphin M5, Rheem

  5. Back To Top    #5

    Join Date
    Mar 2007
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    San Rafael, CA USA
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    12,082

    Re: Can I Lower Ph with Boric Acid?

    Boric acid is a very weak acid so is not suitable for lowering pH. When boric acid is added to water, it mostly remains as boric acid and only some of it dissociates to lower the pH and become borate ion. Adding 50 ppm to water with a pH of 7.5 and initial TA of 80 ppm will lower the pH to 7.3 so even adding enough boric acid to increase borates to their maximum recommended amount doesn't lower pH very much.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

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