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Chlorine Vs Bromine


Comparison of Bromine Vs Chlorine



Effective Disinfectant Form

Hypobromous Acid (HOBr) and Bromamines Hypochlorous Acid

Reaction with Ammonia

Reacts to form Bromamines Reacts to form Chloramines
Major species present are NHBr2 and NBr3 Major compound present is NH2Cl
Does not affect disinfection Reduces disinfection ability

Bromamines or Chloramines as Bactericides

Bromamines are excellent bactericides and exhibit activity similar to HOBr. Chloramines are poor bactericides and have only 5% of activity of HOCl.

Bromamines or Chloramines as Viricides

Bromamines are excellent and exhibit activity similar to HOBr. Chloramines are not effective viricides.

Ammonia removal

Bromine is an effective disinfectant in the presence of NH3. Low levels of NH3 are therefore acceptable. Must super-chlorinate to reduce ammonia level. It is necessary to improve Chlorine effectiveness as a disinfectant by eliminating Chloramines.

Disinfection pH dependence

Bromine has no significant pH dependence in the range 7-8 pH. Chlorine is strongly pH dependent and has only 22% effectiveness of its active form of HOCl at pH 8.0.

Eye Irritation

Bromine produces a significant reduction in eye irritation. Chlorine disinfection can produce eye irritation from the formation of Chloramines.

Halogen Odours

Bromine has noticeably less halogen odour than pools comparably treated with Chlorine. Most "Chlorine" odours result from chloramines which arise from heavy bather load or improper maintenance.

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Last modified: May 27, 2013