So I've seen these things called active Carbon filter tips for joints I don't really know what they're for I think they're supposed to make it healthier or cover the smell but I'm not sure also do they work any better than a normal piece of rolled up cardboard Also I've also found some re usable filters made out of glass and some metal ones to I don't understand the point in these either if anybody has any I'd be really interested in knowing why you bought them and what your opinion of them is I really don't see the point in any of these things iv always used roach books and never really thought about it but maybe there's a lot more to it
I have used them, i prefer a jilter filter than a full on active carbon filter. My girlfriend uses these but its to strong a filter and my high gets effected. the jilter is a half filter that a roach also goes into - its a good compromise between filters and roach.