Perfect Fit: Our cat water fountain filters are perfectly compatible with PetSafe Outlast Pet Fountain 60oz/ 90oz and compatible with Viva pet fountain 64oz/ 140oz, 2.55*2.55*0.15 inch, Each pack contains 10 foam filters. Multiple Filtration: The cat filters for water fountain is filled with premium activated carbon, ion exchange resin and non-woven fabric, fully isolating cat hair and food residue, removing impurities and particles, filtering heavy metals and odors, softening tap water, and obtaining clean and fresh water Safety protection:This pet water fountain filter replacement is made of high-quality materials, safe, and odorless. It plays an important role in improving water quality and protecting the health of pets' urinary systems to keep your pet healthy, Pure water makes cat & dog happier when drinking. Replacement frequency: Please replace the filter cotton of the pet fountain every 2-4 weeks according to the actual usage situation to ensure the health of the pet. Easy to use:The filter element is fully assembled and ready for use at any time. It is recommended to soak the cat water filter for 5 minutes and rinse for 30 seconds before use. 1