【High Density Sponge】Cat Water Fountain Filters Sponges Foams, Compatible with Multi Pet Fountain Replacement Filters for Cat Fountain 【Good Applicability 】Compatible with multiple cat fountain/pet fountains. 【Recommendations】Please soak the filter in water for 2 minutes and rinse it thoroughly under running water before use and change the filter every 2-4 weeks. 【What You Get】12 Pcs cat water fountain sponge filters,worry-free 12 month warranty,friendly customer service.Please contact us if you have any question. Cat Water Fountain Foam Filters, Compatible with Multiple Pet Fountain Dispenser Sponge Filters