Kitchen Compost Caddy Activated Carbon Filter (8 Pack) for use with Pail Labeled NPL-390 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 8 Pack for White and Lime Green Kitchen Compost Caddy & CIty of Beaverton & Forest Grove vented food waste pail with filter mounting hardware (labeled NPL-390 on pail bottom) Absorbs food odor for 6-9 months per set when utilized on our vented pail 2 filters used on each filter change (4 filter changes total)