I have had a few pipes with filters, both 6mm and 9mm and smoked both with out the filter or adapter . They both smoked great without the filters or adaptors. The 9mm filters were for my Winslow pipes and the 6mm were for my Savineli's .I don't know if the majority of you smokes with a filter or not. I own two pipes both of them with the classic charcoal filters. Do you guys swap the filters after each smoke or keep them for a second or even third? Also, has anyone out there used a pipe that has a filter without it?