Kitchen Compost Caddy Activated Carbon Filters (4 Pack) for use with pail labeled NPL-291 ATTENTION: CITY OF BEAVERTON CUSTOMERS: - Our white replacement magnetic lid with filter mounting hardware installed P/N KCC-VL2-MAG-FG must be purchased in order to install / utilize filters. (This item is only available on our Kitchen Compost Caddy website). Activated Carbon Filter 4 Pack for Kitchen Compost Caddy Brown Compost Pail Activated Carbon works fantastic to absorb food odor Designed for use on (NPL-290- labeled on pail bottom) Brown Kitchen Compost Caddy Vented Compost Pail Lasts 6-9 months each absorbing food odor.