Carbon/carbonite filters are used for all sorts of purification. Lately, carbonite filters have been used on bongs. The smoke goes through the carbonite rock, removing carcinogens and other toxins, but not removing the THC. This means you won't cough as much. Regular carbon filters are replaced, while the built in Carbonite brand
ones can be cleaned and maintained. It doesn't magically
make more THC in your smoke, like the other
definition suggests.
Stoner 1: Dude, I love this carbonite filter. It's better than my
old ROOR ash catcher!
Stoner 2: Yeah man, just keep it clean.