most extractions/preparations require filtration of some kind. I've been using coffee filters for a basic codeine extraction and have experienced problems. after filtering to a certian point, they just stop working, and no more liquid will get through. Am i doing something wrong, or sould i just spring for better quality filters?
Yeah, get better filters. You could also just stir the shit you're extracting around while it filters, but that's a pain in the ass.