Hi C-H's, Rob wrote: >As far as I know, the green chlorine gas you don't smell, but this change >when it's attached to water molecules. > > Remembering back to a time I tended a commercial swimming pool for a > > couple of years, I thought chlorine was odorless. No. Chlorine, like the other halogens (fluorine, bromine iodine etc.), has a very pungent characteristic odor. If you think that chlorine is odorless, you probably have no sense of smell. --- Regards, Cameron.