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Thread: Borates and The Pool Calculator

  1. Back To Top    #1

    Join Date
    Nov 2007
    Austin, TX

    Borates and The Pool Calculator

    It appears that the Pool Calculator does not take into account the Borate level when calculating the dose of muriatic acid required to lower pH. Does someone have a formula to make the adjustment. I have about 50 ppm borates and the amount of acid required is Much larger than computed with the pool calculator. This is confirmed by both the acid demand test and results in the pool. I had very good agreement with the pool calculator dosing and acid demand tests prior to adding the borates.

    Thanks all,

    My Pool
    15k Gal Gunite Pool w/8 ft Spa w/Spillover
    Hayward DE Filter + DE Separation Tank
    Legend Sweep, Pentair Gas Heater
    Stenner Metering Pump for Liquid Chlorine Injection (15 gallon tank)

  2. Back To Top    #2

    Join Date
    May 2008
    Is that why I can't seem to get my PH down lately? I didn't know borates affected the PH, but this would certainly explain a lot.
    Good Times

  3. Back To Top    #3
    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD
    That is correct. My Pool Calculator does take the current TA level into account but does not look at the borate level. If your borate level is above about 10 then results for changing the PH will be fairly far off.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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