Package Includes 16 pieces cat fountain filters, each in an individual pack for hygiene and protection. Triple Effect Filter Triple layer design with non-woven fabric, activated carbon and natural resin to effectively clean the water. Outer cotton layer catches dirt, helping to provide purer water for your cat. How to use Soak the filter thoroughly in water before use, then connect it to the cat fountain water dispenser. To maintain clean water, replace the filter promptly. Replacement intervals: 1 to 2 weeks in summer, 2 to 4 weeks in winter. Key attributes Material: non-woven fabric, activated carbon, natural resin, outer cotton layer. Pack size: 16 filters, individually packed. Function: filters water for cat fountains. Performance: helps keep drinking water clean and fresh for pets. Use scenarios - Household with multiple cats: maintain clean, appealing water to encourage regular drinking. - Hot weather or high-use fountains: frequent filtration to keep water fresh and reduce odor. - Pets with sensitive palates: consistent filtration helps ensure water quality remains high and palatable.