- Compatibility: This replacement filter is designed specifically for the PETLIBRO 2.5L cat drinking fountain models PLWF005, PLWF115, and PLWF105, ensuring a perfect fit and optimal performance. - High-Quality Filtration: Each filter consists of activated carbon, ion exchange resin, and non-woven fabric, effectively eliminating bad odors and filtering out impurities, hair, and heavy metals. This guarantees cleaner, fresher water for your pet. - Enhanced Pump Longevity: The built-in filter includes 10 small pre-filter sponges that surround the pump. This design improves impurity filtration, helping to extend the pump's lifespan and maintain its efficiency. - Regular Maintenance Reminder: For optimal performance, it is recommended to replace the filter every 1-2 weeks during summer and every 2-4 weeks in winter. This ensures your pet always has access to clean water. - Practical Applications: Ideal for busy pet owners who want to ensure their cats stay hydrated with clean water. Perfect for households with multiple cats or pets that require consistent water quality. - Quantity Included: The package comes with 10 high-quality replacement filters and 10 replacement pre-filter sponges, providing you with ample supply for long-term use. This replacement filter set is essential for maintaining your PETLIBRO cat drinking fountain, ensuring your pet enjoys the best drinking experience possible.