Has anyone purchased activated charcoalfilter material by the roll or tarp? I have read the other threads of DIYfilter canisters here, but my grow is unique and cannot use thosewonderful ideas until I get a grow tent or something similar. I haveneed of a wide (2' x 6' or larger) roll/tarp of activated charcoal air filter material so Ican line the inside of my grow space. I found this(http://www.amazon.com/Cut-Fit-Carbon-Pad-Purifiers/dp/B000U204W2)but wanted to know if anyone else has used a similar medium for odorcontrol...anyone?