Yea you can only filter BHO once, not sure how you could filter it again? I did try some BHO recently that was filtered through two 120u screens and it was some of the best ive had yet, took me like 5 minutes to get that sticky fucking glob into the bowl, lol. With ISO though just takes two jars pour it back in forth with fresh filters each time, seems to work better when the alcohol n bud is freezing, we just put our jar with the bud an alcohol in the freezer for awhile before we do it. Theres no point in doing another wash if you leave it in the alcohol for awhile, but you have to filter it nice or your ISO will end up being really hard and black not oily n sticky and once it melts on your bowl its impossible to light the weed, no good.
Oh that makes me wonder? How many people who mess with oil have it on a few pairs of pants or shirts, living room table, keyboard, handle to the bedroom, on my freaking drivers license, haha. I cant be the only one who has the problem.
-Otto