ummm i know what hes talking about.....after u smoke out of a bowl for a long time....it gets clogged......it happens with bongs too......once it gets clogged.....sometimes too clogged to hit.....u can just hit it while its empty n get a HUGE hit sometimes multiple huge hits.....i know after about 3 days of use out of my gravity bong i get about 2 big resin hits....its just the leftover crap on the bowl head...not the best hit but it will do if its all there is