Cat Fountain Filter Compatibility This cat water fountain filter is compatible with WF20 and CF20 cat water dispensers. Please refer to the size and shape of the filter when placing your order. The package includes 10 filters and 10 pump filter sponges to meet your cat's daily needs.High Efficiency Filtration This cat fountain filter features triple filtration technology. It contains activated carbon, ion exchange resin, and mineral stone to help absorb organic matter and heavy metal ions, soften water, and provide fresher drinking water for your cat. A high-density cotton layer helps trap hair and debris.Suggestions for Use Soak the filter in water for 2 minutes before use and rinse thoroughly to remove surface dust. For optimal performance and clean water, replace the filter every 30 days. In summer, replace every 12 weeks; in winter, every 24 weeks.Good Water Quality The activated carbon filter effectively removes impurities and improves water quality. It helps ensure your pet's drinking water remains fresh, clean, and safe, supporting overall health and well-being.High Performance This cat water fountain filter helps purify your pets drinking water, promoting health and safety by reducing contaminants. The included pump sponge provides additional filtration for double protection. The multi-piece set supports long-term hydration needs for your cat.