A Carbon Filter is an attaachment sold for Glass on Glass bongs. It is composed a male joint at the bottom, a large spherical chamer to fill with Carbon, with a glasss screen preventing any from falling out, and a female joint on top. A Carbon filter makes even the shittiest china bud taste smokeable. And the taste is undescribable if your smokling a good strain in it! As an added bonus, nearly all the tar is filtered out of the hit and your bong will never get dirty.
by GanjaSmugglin June 15, 2011