Just added an Odor Sok to my setup and it killed the smell almost instantly. I got a 6 inch by 24 inch which is rated at 450cfm and my 6 inch fan is 449. It was 80 bucks shipped from ebay. Great alternative to the heavy metal can filters as far as size weight and flexibility. Not sure how its longevity will be. They say 6 months. Not sure if thats counting 12 hrs a day or 24. My fans only run when the lights are on which is 12 hours. They come in different sizes. Impressed so far. Just thought I'd share.