Help control and stop foul and gross kitchen odors with BioStrike Compost Crock filters. Activated carbon impregnated non-woven polyester batting helps minimize odors from collected kitchen scraps for composting. Each 5.5-inch round filter measures 7/16-inch thick. Easy to use; filter fits inside the cover of the crock. If your compost crock lid is smaller than the filter, just cut the filter down to the size you need. Each charcoal filter absorbs odors for 6 to 8 weeks. Effective for compost odors, kitchen crocks, rotting food smell, trash can odor, compost pail odor, composting bucket smell, compost jar for counter, apple compost bin and more. Filters come packaged in a resealable bag to keep fresh.