I am trying to isolate bromine from 1-Bromo-3-Chloro-5,5-Dimthylhydantoin (BCDMH used for pools). I would assume I could do this by passing chlorine gas through an aqueous solution but it is not soluble in water. Since this is used in pools, it must eventually dissolve/decompose so maybe then it would work. Any other possible methods? Molten state? By the way, I can't find any NaBr tablets.