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. 20 Packs: Each pack contains 20 replacement filters and 20 sponges for pet fountains. The filters and sponges are individually wrapped and sealed to ensure high quality. Depending on your pet's drinking habits and the number of pets using the fountain, we recommend cleaning the fountain weekly and replacing the filter 1 to 2 times per month to maintain fresh, clean water. Easy to Install and Clean: This pet fountain filter is simple to remove and replace, saving time during maintenance. Before first use, soak the filter and sponge in water for at least 3 minutes to activate optimal filtration performance, then rinse thoroughly under running water. This helps keep water fresh for a longer period. Triple Circulation Filtration: The replacement filter features a 3-stage filtration system that includes activated carbon, ion exchange resin, and non-woven fabric. This combination effectively reduces impurities such as pet hair and heavy metals while improving water taste and quality. It helps promote hydration and supports your pet’s overall health by providing consistently clean water. Reliable Material and Service: Made from safe materials, this cat water fountain filter is designed to not affect your pet's health. Use with confidence. Type: Cat Water Fountain, Pet Fountain Filter Product Benefits: Removes dust, removes odor, removes pollutants, removes iron, maintains fresh water Color: White & Black Material: Polyester Package Contents: 20 x Filters 20 x Sponges Note: The package includes only the items listed above. Other products are not included. Light reflection and differences in display screens may cause slight variations between the color of the item in the image and the actual product. Measurement may vary by up to +/- 1-3 cm.