Looking forward to the time when I will need to have a scrubber I believe I would prefer a vacuum system similar to the one employed by philddreamer. It is 4metals design if I remember correctly. I have two pumps that I salvaged from some medical equipment and I would like some opinions as to whether these will work or not or how long they may last. They are the "Wob-L" design compressor made by Thomas Ind. and they should pull 27 inches of vacuum. I don't know how many CFM they can move. The best I can determine is 2-4 CFM but that info was vague. If anyone has any experience with these pumps I like to hear about it.