Water Fountain Replacement Filter: This cat water fountain replacement filter measures about 7.6 x 4.3 cm/3 x 1.7 inches and 8 x 2.8 cm/3.1 x 1.1 inches, suitable for most cat fountains. Please confirm the size before placing an order. Multiple Filtration: Cat water fountain filter, triple filtration composed of cotton layer and activated carbon can capture hair and dirt, eliminate odor in the water and purify every drop of water for your pet. High-quality Material: The cat fountain filter uses natural non-woven fabrics, activated carbon made from coconut shells and ion exchange resin, can effectively filter impurities in the water. Make your pet love drinking. Usage Tip: Please soak the filter in water for 5 minutes and rinse thoroughly under running water before use. It is recommended to replace it every 1-4 weeks and clean the water pump every 3-5 days to ensure clean drinking water. Package Content: You will receive 8 carbon filters and 8 foam filters for cat fountains. The