Brita filters

[Jillian Johnston]

Could some-one tell me haw Brita filters work.  Are they just
activated charcoal or do they also contain ion-exchange beads? A
friend said she drank treated water to remove some of the
minerals which doesn't jive with my understanding fo how these
filters work.
Thanks for your help.

--
Jillian Johnston
Dept. of Biological Sciences       Guider
Univ. of Calgary         	   30 Pathfinders, Tanisi District