600 page? Is it all about cannabis?

Thats a big ass book! I might have to check it out...
GetThisOrDie Reviewed by GetThisOrDie on . Carbon scrubber I have a carbon filter that I want to set up as a scrubber. I don't want to loose any of my co2 so I would basically just hook my online fan to the carbon filter and hang it from the roof. No ducting to vent it out of the room correct?? Rating: 5