Compatibility - Fits 3.2L/108oz ship-shaped cat drinking fountains - Fits 3.2L/108oz stainless steel fountains with water level window - Fits 4L/134oz cat fountains Filter composition and function - Constructed with non-woven fabric, activated carbon, ion exchange resins and a PP plastic shell - Adsorption-based filtration provides effective removal of impurities and water softening - Captures cat hair and debris, reduces odors, and softens water Benefits - Keeps drinking water clean and fresh for your pet all day - Supports higher water intake and overall hydration - Helps reduce the risk of urinary tract infections by maintaining water quality Maintenance and replacement - Replace the filter every 1-2 weeks - In summer, replace every 2-4 weeks - If more than one pet uses the fountain, more frequent changes are recommended Practical use scenarios - A single-cat home using a compatible 3.2L ship-shaped fountain for regular filtration - Multi-pet households where frequent water changes ensure clean water for all pets - Homes with hard or warm-water conditions, where regular replacement helps maintain better water quality Notes - These are spare filters designed for compatible cat fountains - Maintains function, compatibility, size, material and performance without altering original specifications