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.