Replacement carbon filters catch hair and debris, remove impurities and odors, keep water fresh. Please Note: Only use in the YOUTHINK Pet Fountain! (NOT fit Catit Fountain) Charcoal Filters: Premium Activated Carbon + Cotton 4 Pack Premium Activated Carbon Filters, Size: 5" x 0.4" (D x H). Replace the filter every 2-4 weeks to maintain water freshness, keep your family friends a happy life. Please note: Rinse the filter thoroughly with water before use.
