Norpro 94F Replacement Filter For Bamboo Compost Keeper 2 Count 2 Piece Compost Keeper replacement filter set Charcoal filter helps to eliminate odor of food waste Keep your Compost Keeper odor free for up to 6 months The filter should not be washed and reused The charcoal in the filter absorbs the odors and once it has fully absorbed to its maximum, discard filter.