your better/ safer using a carbon filter and then may be getting some ONA in the room to help a bit. if smell is a problem then get somthing like car body filler or contact adhesive in cups around the grow room that stuff will over power the smell of weed your house will smell like a garage, but cannabis will not be smelt.
I posted asking the same thing about a month ago, and was told that the gel was the most efficient and could be reactivated when it wore out by adding a bit of water.
I have some odor removing stuff comes in a lil circle container (I'll edit in the name later when I get off of my lazy ass). I hear it works, I'm about to start vegging, I'll let you know.
Don't waste your time. It'll still smell like dank in the room, just with a hint of something else. Try to stick with carbon or charcoal. The charcoal ones aren't as expensive. Goto HydroFarm and check out the Goblin or the Elf.