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Thread: PoolMath Error

  1. Back To Top    #1

    Join Date
    Nov 2016
    Location
    Helena, AL
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    PoolMath Error

    I think that I came across a calculation error this morning on PoolMath. It is in the PH adjustment box. Here are all of the numbers that I have in the system in the format of actual/target

    Size = 20000
    FC = 5/5
    PH = 7.5/7.9 (raising it because I'm getting ready to add boric acid)
    TA = 50/50
    CH = 200/200
    CYA = 35/35
    Salt = 2000/2000
    Borate = 0/50
    Temp = 65


    The box next to PH is telling me to add 29 oz by weight or 28 oz by volume of borax. But - If I put the 29 oz of borax (20 Mule Team) in the "Effects of adding chemicals" section, it tells me that the PH will raise by 0.16... not the 0.4 that I have as the differential in the PH section.
    30k IG vinyl w steps , Pentair SuperFlo 342001 pump, StaRite Cristal-Flo sand filter T-240-BP1
    Hayward Goldline AQR15 SWG, Dolphin Premium (aka S300i) Robot
    Borates & TF100 test kit
    200 gal hot tub (that I completely rebuilt)

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    JoyfulNoise's Avatar
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    May 2015
    Location
    Tucson, AZ
    Posts
    14,091

    Re: PoolMath Error

    The "Effects of Adding Chemicals" section has a note written above it that states that the pH calculations are not exact. The reason being is that section needs to make assumptions about a waters TA and other levels and it does not calculate large adjustments to pH very well. The section above is more accurate.

    You do not need to raise your pH. Boric acid is a weak acid and adding enough to achieve 50ppm borates rarely lowers the pH much more than 0.1 to 0.3 units. I did not raise my pH at all before adding borates and I was fine.
    Matt
    16k IG PebbleTec pool, 650gal spa, spillway and waterfall, 3HP IntelliFlo VS / 1.5HP WhisperFlo, Pentair QuadDE-100 filter, IC40 SWCG, MasterTemp 400k BTU/hr NG heater, KreepyKrauly suction-side cleaner Dolphin S300i robot, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

  3. Back To Top    #3

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    Nov 2016
    Location
    Helena, AL
    Posts
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    Re: PoolMath Error

    Thanks for the answer... the "Effects of adding" said that the ~50# of boric acid would lower pH by 0.3, guess I'm gonna find out


    30k IG vinyl w steps , Pentair SuperFlo 342001 pump, StaRite Cristal-Flo sand filter T-240-BP1
    Hayward Goldline AQR15 SWG, Dolphin Premium (aka S300i) Robot
    Borates & TF100 test kit
    200 gal hot tub (that I completely rebuilt)

  4. Back To Top    #4
    JoyfulNoise's Avatar
    Join Date
    May 2015
    Location
    Tucson, AZ
    Posts
    14,091

    Re: PoolMath Error

    Quote Originally Posted by bakrbj View Post
    Thanks for the answer... the "Effects of adding" said that the ~50# of boric acid would lower pH by 0.3, guess I'm gonna find out


    Sent from my iPhone using Tapatalk
    It won't lower it that much. Mine barely went down by 0.2.
    Matt
    16k IG PebbleTec pool, 650gal spa, spillway and waterfall, 3HP IntelliFlo VS / 1.5HP WhisperFlo, Pentair QuadDE-100 filter, IC40 SWCG, MasterTemp 400k BTU/hr NG heater, KreepyKrauly suction-side cleaner Dolphin S300i robot, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

  5. Back To Top    #5

    Join Date
    Nov 2016
    Location
    Helena, AL
    Posts
    227

    Re: PoolMath Error

    I put a 4 lb box of borax in the pool - favoring the bottom number on the calculator page over the top number... then added 50# of boric acid... the end result was a pH of 7.5, so I guess it turned out OK
    30k IG vinyl w steps , Pentair SuperFlo 342001 pump, StaRite Cristal-Flo sand filter T-240-BP1
    Hayward Goldline AQR15 SWG, Dolphin Premium (aka S300i) Robot
    Borates & TF100 test kit
    200 gal hot tub (that I completely rebuilt)

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