RSVP Filters for Pail are designed specifically for use with compost pails, helping to keep odors under control. These filters are i for larger compost pails measuring 11 inches tall and holding 1.5 gallons. To maintain freshness and effectiveness, it is to replace the filters every 4 to 6 months, or more frequently depending on how often you empty your compost pail. This practical solution ensures your composting area stays odor- and pleasant.