I misunderstood what this product was. I thought the anti-microbial cylinder was a disk that went in the middle of the waste bin, but it's actually a disk that dispenses anti-microbial trash bags. If I'd known this, I would have saved my money and bought a small step-can and some scented trash bags. Now I'm kind of mad that I have to keep buying special refill bags because this thing isn't designed to take regular trash bags.