Compatibility for Catit Fountain Filters - Our fountain filter is compatible with Catit Design Senses Fountain, Flower Fountain, Senses 2.0, and Fresh & Clear Stainless Steel models (not compatible with Mini Fountain). Excellent Triple Filtration - These cat water fountain filters are filled with premium fiber cotton, activated carbon, and ion exchange resin, providing triple-action filtration to effectively capture pet hair and food debris, reduce impurities and particles, filter heavy metals and odors, soften tap water, and deliver clean, fresh water. Upgraded Structure with Dense Filter Cotton - Increased filter holes and expanded filter surface area allow for faster and more thorough water filtration. Enhanced filtration performance helps maintain cleaner, fresher water for longer periods. Supports Your Cat's Health - By reducing odors, removing impurities, helping prevent buildup of minerals, and minimizing the risk of urinary tract issues, these replacement filters promote consistent hydration and overall well-being for your cat. Regular Replacement Recommended - To remove loose carbon dust, soak the replacement filter in water for 510 minutes before first use, then rinse thoroughly under running water. Replace every 12 weeks in summer and every 24 weeks in winter. For multi-cat households, more frequent changes may be necessary to maintain optimal performance.