So I have 1 vial of local garage lab gear left (yeah, I know local bad...everywhere else good). The stuff is super strong and has way too much solvent so the pip is horrible (have labs to prove potency). In the past I always baked and filtered the stuff, but never flushed the filter out with more oil. It seems that you need to push about 2cc oil through the filter after to get what was left behind. So question is, if I flush with whatever oil (cotton/grape seed) will it need to be sterilized before or will pushing it through the filter (.20) sterilize it?