F-Matic One passive air system offers 60 days of odor control in an environmentally responsible way. Contains Metazene, a proven molecular odor counteractant that effectively fights odors, rather than merely masking them. Covers 6,000 cubic feet. Reliable gravity-operated system; doesn't depend on batteries, fuel cells, or any other artificial means of power. Contains 40 percent more liquid than competitors, for stronger odor control over 60 day cycle. Easy to use pop and go refill designed for quick servicing. Fits competitors' dispensers for easy switchover. Completely recyclable refill.