Usage Tips:Pack of 20 - Drinking fountain filter replacement filters for Catit PIXI 【Compatibility】Compatible with Catit PIXI 2.5L Water Fountain, for Cat Fountain Model 43717, please check your fountain model before purchasing. These are replacement filters and are not manufactured or sold by Catit. 【Usage Recommendations】To prevent the activated carbon dust on the water, soak the filter in water for 3-5 minutes and rinse thoroughly under running water before use. Depending on your pet's drinking frequency and the number of pets using the fountain, change the filter every 2-4 weeks. 【High-quality materials】Each pet fountain filter is made of a cotton layer, activated carbon and an ion exchange resin. They can filter hair and heavy metals and improve the taste of water, allowing pets to drink clean and fresh water all day long, helping to increase water consumption and reduce the risk of urinary tract infection. Specification: Product Name: Cat Fountain Filter Material: Non-woven fabric + Activated Carbon Size: 8.4 x 8.4 x 0.9cm, Middle Hole Diameter: 1.7cm Package Included: 20pcs Cat Fountain Filter Note: Not an original product. Cat fountain not included.