Can i go from bromine to chlorine ? hair/costumes going green

[PoolDoc]

Hi Corellia;

#1 - Chlorine does not cause green hair; copper does.
#2 - The presence of either chlorine or bromine makes copper more likely to stain, BUT
#3 - The absence of chlorine or bromine means the pool is unsafe.
#4 - This Once a bromine pool, always a bromine pool page will explain things you need to know.
#5 - Neither chlorine nor bromine add copper to your system, or cause copper to erode. But, some chlorine products now have copper mixed in. You'll have to read the label -- it wouldn't do you any good for me to tell you US brands that do this, and I don't know UK brand names.
#6 - Low pH (less than 7.0) WILL erode pool heaters.

[waterbear]

Also, copper is used in a lot of algaecides so that could also be the source.