Pack of 20 - Replacement drinking fountain filters for Catit PIXI Compatible with Catit PIXI 2.5L Water Fountain and Cat Fountain Model 43717. Please verify your fountain model before purchasing. These are replacement filters and are not manufactured or sold by Catit. To reduce activated carbon dust, soak the filter in water for 3-5 minutes and rinse thoroughly under running water before use. Replace the filter every 2-4 weeks depending on your pet's drinking habits and the number of pets using the fountain. Each filter features a cotton layer, activated carbon, and ion exchange resin to help remove hair, heavy metals, and impurities. This helps improve water taste and provides clean, fresh water, encouraging increased water intake and supporting urinary tract health. Product Name: Cat Fountain Filter Material: Non-woven fabric + Activated Carbon Size: 8.4 x 8.4 x 0.9 cm, Middle Hole Diameter: 1.7 cm Package Includes: 20 pcs Cat Fountain Filter Note: Not an original product. Water fountain not included.