Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 7 of 7

Thread: Why Bromine = Free Chlorine multiplied by 2.25?

  1. Back To Top    #1

    In the Industry

    Join Date
    Feb 2013
    Location
    Pool Country
    Posts
    138

    Why Bromine = Free Chlorine multiplied by 2.25?

    Why does Bromine equal Free Chlorine multiplied by 2.25?

    Thanks

  2. Back To Top    #2
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: Why Bromine = Free Chlorine multiplied by 2.25?

    The test effectively count molecules, but reports ppm which is a percentage of weight. 2.25 is the ratio of their weights.
    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

  3. Back To Top    #3

    In the Industry

    Join Date
    Feb 2013
    Location
    Pool Country
    Posts
    138

    Re: Why Bromine = Free Chlorine multiplied by 2.25?

    So, Bromine is 2.25 times lighter than Chlorine? Chlorine is 2.25 times heavier than Bromine?

  4. Back To Top    #4
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: Why Bromine = Free Chlorine multiplied by 2.25?

    The other way around, bromine weights more, so the same number of molecules is a higher percentage of the total weight (i.e. ppm).
    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

  5. Back To Top    #5

    In the Industry

    Join Date
    Feb 2013
    Location
    Pool Country
    Posts
    138

    Re: Why Bromine = Free Chlorine multiplied by 2.25?

    Excuse me, so, Bromine is 2.25 times heavier than Chlorine? Chlorine is 2.25 times lighter than Bromine?

  6. Back To Top    #6
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: Why Bromine = Free Chlorine multiplied by 2.25?

    Correct. Bromine has an atomic weight of 79.9, while chlorine is 35.4. The ratio is right around 2.25.
    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

  7. Back To Top    #7

    In the Industry

    Join Date
    Feb 2013
    Location
    Pool Country
    Posts
    138

    Re: Why Bromine = Free Chlorine multiplied by 2.25?

    Thank you for the explanation.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •