Package Included: 12pcs Cat Flower Fountain Replacement Filters. Please check the size of the water dispenser slot before purchasing. Wide Compatibility: The pet fountain filter is compatible with 1.6L 2.0L 2.4L and other pet fountains of the same size. Dimensions: outer diameter 12.7 cm, inner diameter 3.8 cm. [Good filtration effect]: The filter is made of resin and activated carbon, which can filter odors and impurities such as cat hair, gravel, coarse dust, etc. in the water, providing only fresh water for humans, cats, dogs, and other pets. How to use: Rinse the filter thoroughly with water before use, and then easily connect it to the water dispenser. To ensure the cleanliness of the water, the filter should be replaced in time. Replace within 2-4 weeks.