I started using this after about 1 week with my new ferret. Not because of an over-powering odor, but just to try it out and see if it helps at all. So far, it doesn't seem to. I've gone thru almost the whole bottle and find little difference. As a matter of fact, even though I've kept up with weekly cage cleaning, twice daily litterbox scoopings, and an occasional brushing and spritzing of ferret sheen, the odor seems to be worse now than before. As best as I can tell, the Bi-Odor has had little to no effect. Steve [Posted in FML issue 4533]