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Thread: Borate pool calculator

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    Join Date
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    Borate pool calculator

    If using 20 mule borax, which drop down box do I use: borax or tetraborate pentahydrate.
    Thanks, john
    14,000 gallon IG DiamondBrite pool with 2 ea. waterfalls and slide, Hayward Tristar 2.0 HP 2-speed pump, Hayward 3/4 HP waterfeature booster pump, Hayward 48sf DE filter, Hayward PS4 wireless controller, 1 skimmer and 4 returns, Polaris 280 pressure cleaner w/booster pump, 7 x 7 spa w/6 jets, TF-100 Test Kit w/speed stir

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    JasonLion's Avatar
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    Re: Borate pool calculator

    Use the "borax" setting for 20 mule team.

    (Borax is the decahydrate form, not the pentahydrate form. Tetraborate pentahydrate is the chemical most commonly used in borate products sold in pool stores.)
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    Re: Borate pool calculator

    Quote Originally Posted by JasonLion View Post
    Use the "borax" setting for 20 mule team.

    (Borax is the decahydrate form, not the pentahydrate form. Tetraborate pentahydrate is the chemical most commonly used in borate products sold in pool stores.)
    The pool math calculator shows 495 ox of borax for 30 ppm in a 14,100 gal pool.
    This calculates out to 250 ppm or about 120 ppm sodium borate, accounting for the decahydrate.
    Can someone explain this apparent discrepancy?

    Thanks
    Texaspops
    In ground, inherited, 30 yr old, concrete with plaster. 14,100 gals, triangular, 3.5 ft uniform depth. Pool Valet bottom cleaning system. Autochlorinator using 3" tablets (now stopped using!). Spa with overflow into main pool (1500 gals). Jacuzzi Magnum pump.
    Lots of southern live oak trees!

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    Re: Borate pool calculator

    The ppm or mg/L units of measurement for borates are in weight of atomic Boron, not borate ion. Boron has a molecular weight of 10.81 g/mole.

    20 Mule Team Borax is sodium tetraborate decahydrate with a molecular weight of 381.37 g/mole and there are four boron per molecule.

    So 495 ounces of Borax in 14,100 gallons is the same as 262.92 mg/L of borax product but 262.92 * 4 * 10.81 / 381.37 = 29.81 mg/L Boron.
    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
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