I had a huge 8" Can-Fan brand filter and replaced it with the smaller 8" Phresh Filter. The Phresh filter definately outperformed the CanFilter. I also have a Uvonair 5000 ozone generator, but nothing could stop the stink of 60 or so Sour D's. I have 6 other strains going, but as soon as I dropped the Sour D from the lineup my odor problems disappeared. Well almost. Lets just say it SIGNIFICANTLY reduced my problem.