AC Infinity Refillable Carbon Filter Kit, with Charcoal Refill, 6-InchDescription Reusable Carbon Filter: This patented filter eliminates the need to replace entire filters. Included is one or more refills which matches the filtration capacity of two standard 6 carbon filters at a lower cost. The filter is designed with removable twist off flanges for easy, tool free refilling using the supplied funnel and scoop. The larger chamber has been lab tested to block odors as effectively as standard filters without requiring