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. 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. Easy to Install and Clean: This pet fountain filter replacement is simple to remove and replace, saving time during cleaning. Soak the filter and sponge in water for at least 3 minutes before use to activate optimal filtration performance, then rinse thoroughly under running water. This helps keep water fresh for a longer period. Triple Circulation Filtration: Features a 3-stage filtration system including activated carbon, ion exchange resin, and non-woven fabric. Effectively reduces impurities such as pet hair and heavy metals, while improving water taste and quality. Helps support your pet's health and hydration by providing clean, fresh water daily. Reliable Material and Service: Made from safe, non-toxic materials that do not compromise pet health. Use with confidence. Type: Cat water fountain Type: Pet fountain filter Product Benefits: Removes dust, reduces odors, filters pollutants, removes iron, provides fresh water consistently Color: White & Black Material: Polyester Package Contents: 20 x Filters 20 x Sponges Note: Light reflection and display settings may cause slight color variations between the image and the actual item. Measurement may vary by +/- 1-3 cm.