Oggi Replacement Charcoal Filters for Compost Pails # 7319, Set of 2 Set of 2 Replacement Charcoal Filters, for Oggi Compost Pails # 7319 Charcoal filter helps absorb odors for up to 2-3-month Replace every 2-3-month as needed Simple to use Made specifically to fit for Oggi Compost Pails # 7319