A carbon scrubber uses a charcoal filter, and there is a guide in the grow faqs on how to make one.

I think you need to search a little. It takes time for people to upload photos. There's lots of photos of carbon scrubbers at grow shop websites.
Opie Yutts Reviewed by Opie Yutts on . Odor Control What's an efective way to control odor from 5-10 plants in a 10x8 room? I keep seeing stuff about a carbon scrubber, but what's that? Same thing as a charcoal filter? And would a carbon scrubber require one to duct the air up through the attic? Anybody have a photo of a carbon scrubber in action? Rating: 5