Effective prevention of dust, hair, and impurities. Helps prolong the lifetime of pump and water fountain. Filter 3.0: Filter unit 3.0 is compatible with PETKIT Eversweet 2S, Eversweet 3, Eversweet 3 Pro, Eversweet Solo, Solo SE, and Pure Drink cat and dog water fountains. Multi-layer filtration system: Enhanced filtration performance. Features dual filter components and a high-density micropore filter to remove pet hair and most impurities, ensuring pets drink clean and fresh water. Attention: Soak the filter in clean water for at least 10 minutes before first use. Replace every 30 days under normal usage. (Actual replacement time may vary depending on filter condition; the LED indicator will notify when replacement is needed.) Reset the device after replacing the filter. It is recommended to clean the water fountain and replace the water once a week to maintain pump and filter performance. Item model number: Filter Color: White Material: Plastic Package Contents: 5 x Water Fountain Filters 5 x Filter Cotton Package includes only the items listed above; other products are not included. Note: Lighting and display differences may cause slight color variations between the image and the actual item. Measurement error allowance is +/- 1-3 cm.