I use a lot of cannabis for crohn's and several other autoimmune disorders. this filter with some organic cotton makes difference in the world. You cant beat the price and delivery

This company and the glass filter for charcoal is just incredible. To add some organic cotton is that much better(it does get nast fast) needs changing often for best results. nothing is as good as after you clean it and add all fresh coal and cotton to it. A must have piece in 18 or 14mm.