Introducing the Catit Airsift Dual Action Odor Reducing Pad, your new ally in keeping nasty litter box odors at bay. It is quick and easy to install, and effective for a whole month. Combines two cat-friendly filter media: our powerful Catit Magic Blue ammonia buster and activated filter to effectively lock in unpleasant smells. One Airsift filter pad lasts for 30 days (based on a single to two-cat household with daily scooping of the litter box). By removing litter box odors as well as ammonia, it keeps a fresh and clean smell in the room for you and your cat. Available as a two (2) or six (6) pack.