The guy that I am working with showed me plans for a "push-pull" reactor. Supposedly produces higher quality bio, and claims to so good no washing is needed (sorry, I don't think I push it that far, but if it is better quality going into the wash...) Anyway curious as to what your opinions are.
I use his GL! process and built my processor accordingly. Works great so far. Working on a centrifuge to speed up the finish fuel time so as to not have to relay on settling 100% to filter out the soaps.