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. All items 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 replacement filter is simple to remove and replace, saving time during maintenance. Soak the filter and sponge in water for at least 3 minutes before first use 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 composed of activated carbon, ion exchange resin, and non-woven fabric. This combination effectively removes impurities such as pet hair and heavy metals while improving water taste and quality. It helps keep pets hydrated and healthy by providing clean, fresh water daily. Reliable Material and Service: These cat water fountain filters are made from safe, non-toxic materials that do not compromise pet health, ensuring safe and worry-free use. Type: Pet Fountain Filter Product Benefits: Removes dust, removes odor, removes pollutants, removes iron, provides fresh water continuously 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. Note: Lighting effects and differences in display screens may cause slight variations between the color of the item in the photo and the actual product. Measurement may vary by +/- 1-3 cm.