Carbon replacement filters trap hair and debris, remove impurities and odors, and keep water tasting fresh. Please note: Use only in the YOUTHINK Pet Fountain! (Not suitable for Catit Fountain) Carbon Filters: Premium Activated Carbon + Cotton Pack of 4 Premium Activated Carbon Filters, Size: 5" x 0.4" (D x H). Replace the filter every 2-4 weeks to maintain the freshness of the water, keep your family friends. A happy life. Note: Rinse the filter well with water before use.
