Miele Active AirClean 30 Filter Plastic Imported combines two Super Air Clean filters with a thick layer of Activated Charcoal to provide heavy duty trapping of unpleasant odors The completely sealed systems in Miele S142 to S168 Universal and Little Giant Uprights, when equipped with this exhaust filter, will provide outstanding filtration plus excellant odor control This is recommended of pet owners who desire better odor control