This cat water fountain filter is compatible with stainless steel 67 oz/2L, 101 oz/3L, and 108 oz/3.2L pet water fountains. Please check your machine model carefully before purchasing. Each pack contains 20 replacement filters and 20 sponges, individually wrapped and sealed to ensure high quality. Depending on your pet's drinking frequency and the number of pets using the fountain, we recommend cleaning the fountain once a week and replacing the filter 1 to 2 times per month to maintain fresh and clean water. The replacement filter is easy to install and remove, saving time during maintenance. Soak the filter and sponge in water for at least 3 minutes before use to activate optimal filtration performance, then rinse thoroughly with running water to extend water freshness. The filter features a triple filtration system made of activated carbon, ion exchange resin, and non-woven fabric that work together to effectively remove impurities such as pet hair and heavy metals, while improving water taste and quality. This helps keep your pets healthy and hydrated by providing clean, fresh water daily. Made from safe, reliable materials that do not harm pets. Type: Cat Water Fountain Filter. Product Benefits: Removes dust, odor, and pollutants; reduces iron; ensures fresh water. Color: White & Black. Material: Polyester. Package Contents: 20 x Filters, 20 x Sponges. Light reflection and display differences may cause slight color variation between the image and actual item. Measurement may vary by +/- 1-3 cm.