- May 9, 2018
I recently acquired a Vauen pipe with the 9mm charcoal filter...how often should these filters be changed.
Blue end towards your mouth, white end towards the bowl.Cool, thank you everyone. I am using the Dr Pearls and I will change them after every smoke...is there an orientation in which they are supposed to be used? I noticed one side is blue and the other white. I also obtained an insert and will try this as well