How often do you change/clean your screens?

[Hektik]

well lets see.....with me i will keep smokin off the same screen until it's so clogged i can't hit it anymore...then i put it in the top of the pipe (not actually pushing it down) dry fire it a couple of times (sometimes you get a nice hit off of them) then i'll scrape it with a razor or knife and dry fire it again....good as new....after doing this a couple of times i throw it out....after that it just seems to disgusting to me...but that's just me i try to use as few as possible going through my sack....

Saved me the time of typing all that