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. This pack includes 20 replacement filters and 20 sponges. Each filter and sponge is 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 once a week and replacing the filter 1 to 2 times per month to maintain fresh, clean water. The filter is easy to install 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 with running water. This helps keep water fresh for a longer period. The replacement filter features a triple filtration system made of activated carbon, ion exchange resin, and non-woven fabric. This combination effectively removes impurities such as pet hair, dirt, chlorine, and heavy metals, while improving water taste and quality. It helps promote hydration and supports your pet’s overall health by providing clean, fresh water daily. The materials used in this cat water fountain filter are safe and will not harm your pet. Type: Pet Fountain Filter Color: White & Black Material: Polyester Package Contents: 20 x Filters, 20 x Sponges Note: Light reflection and differences in display screens may cause slight variations between the color shown in the image and the actual product. Measurement may vary by +/- 1-3 cm. Only the items listed above are included; other accessories are not part of this package.