Sponge Posted July 3, 2016 Report Share Posted July 3, 2016 Is the free chlorine reading relevant on a bromine based hot tub? Quote Link to comment Share on other sites More sharing options...
Dr. Spa Posted July 3, 2016 Report Share Posted July 3, 2016 Not really...though there is a multiplier you can use to convert it's chlorine results to accurate bromine results (I don't remember the number to multiply by). Quote Link to comment Share on other sites More sharing options...
Sponge Posted July 3, 2016 Author Report Share Posted July 3, 2016 I think you mean the total chlorine and total bromine. According to my meter total bromine is total chlorine times two. I was referring to free chlorine (but then again maybe that too has a correlation to bromine that I wasn't aware and you were right!). Quote Link to comment Share on other sites More sharing options...
chem geek Posted July 9, 2016 Report Share Posted July 9, 2016 Total Bromine will measure as Free Chlorine in a DPD or FAS-DPD type of test. The reason is that monobromamine (i.e. inorganic combined bromine) is in equilibrium with monobromammonium ion that may release a positively charged bromine ion that reacts with DPD. Since this is also how this combined bromine is still effective as a disinfectant, it is not necessary to measure true Free Bromine and there isn't an easy way to do that anyway. The factor of 2.25 applies to any chlorine reading to convert to the corresponding bromine reading though as I wrote you can convert from Free Chlorine to Total Bromine using this factor (a factor of 2 is approximate and reasonable). Quote Link to comment Share on other sites More sharing options...
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