Depends what you want to do. For trapping, use high density glass (3lb per cu.ft.). Carpet on bare floor at first reflection points. Difusion is a little more complicated.

There are some good articles on treating rooms at

I gave up on my concrete bunker because I don't have the room and I would need to treat a LOT.


Blujays1: Spending Fred's money one bottle at a time, no two... Oh crap!