Never cared if it did until my last smoke a few days ago. The pipe started to gurgle which it almost never does, however it was a PG flavored blend Seven Seas Gold so not very dry and the humidity was insane outside. I didn't think my filter pipe would pass a clean however it did easily. But now at least I get why that could be a make or break for a pipe. Second point if you think it won't pass a cleaner gently twisting the cleaner while barely pushing it in works way better then it seems like it should.