Advantages to a carbon filter adapter-
Reduces smell of exhaled smoke, keeps the rest of your glass cleaner then any amount of water diffusion/filtration, removes SOME of the bad stuff in smoke, and IMO gives better taste.
The thing is that carbon/charcoal dust can be dangerous(black lung) if you don't wash and dry it properly before use. Just run water through it a bunch of times, let it soak in water for a while, rinse some more and just let it dry. Most importantly, make sure to do this all in a well ventilated area.
Trust me, an activated carbon filter does a better job of cleaning up the smoke then an ashcatcher. I would reccomend a disk diffused carbon filter from SSFG so you don't need to mess with a glass screen.
Vaporizers: Myrtle PD, MFLB, Cherry SSSZap, brass Walnut Zap, Ceramic Rockzap[CRZ] X2, Da Buddha, Life Saber, GonG Gn0me
Glass: Headford inline bubbler, BC2011 gridded showerhead bubbler, Dirty Rico reverse circ, Roor Zumo, SSFG mini beaker, SSFG straight 11", Illadelph special edition 7mm straight w/ frosted NYC skyline.