A PETMATE® Zeolite Filter helps to reduce and absorb cat litter box area odors in your home for up to 3 months. Filters are safe, natural and non-toxic charcoal, making pet and pet parent happy. The filter uses powerful Zeolite Charcoal particles to trap airborne odor and molecules. Easy to load and replace making sure the bad smells stay in the litter box. Great for homes with either a single cat or multiple cats.