Effective prevention of dust,hair and impurities. Help prolong of pump and water fountain. Filter 3.0: filter unit 3.0 is applicable for 2s, 3, 3 pro, solo and solo se, and pure drink cat dog water fountain. Muti-layer filtration system: Improved filtration function. Utilizing double filter components and a high density filter, filter unit 3.0 filters remove pet hair and most other impurities, ensuring your pets always drink the most clean and fresh water. Attention: Please soak the new filter in clean water for at least 10 minutes before using. Replace every 30 days in normal mode.(The actual replacing time depends on filter status, and the led indicator will remind you when the filter need to be replaced.) Please reset the device after replacing filter. We recommend that you clean the water fountain and replace water once a week, this will protect the water pump and filter. Item model number: Filter Colour:White Material:plastic Package Contents: 5 x Water Fountain Filter 5 x Filter Cotton Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.