Nitrous cutting out

Well I'm pretty sure I found the problem! My nitrous filter had a lot of debri in it. Looking through the screen...it's probably 80% clogged. The stuff clogging it looks kind of like teflon. I know not to use teflon tape on nitrous connections though. I've always used liquid teflon on all the fittings on my nitrous system. So how would chunks of teflon get embedded into the filter like that? Or is it possible that the nitrous that I just got filled into my bottle was somehow dirty?! So I'm cleaning the filter out & rebuilding my nitrous solenoids. I want to make sure none of this crap got past the filter and into the solenoids.