Your solution to smelly compost collections! When you insert Garland Odor-Free Replacement Filters into the lid of your compost caddy you won’t smell the food scraps as they sit and wait to be taken outside to your compost bin. Each filter is made of activated charcoal a natural material that neutralizes odor. Each filter will provide odor protection for up to four months. These filters are designed to be used with the Jumbo Odor-Free Compost Caddy and the Odor-Free Compost Caddy.