Compatibility: This cat water fountain filter is suitable for the eversweet max cordless dog water fountain, please make sure these cat fountain filter replacement size is compatible with your cat fountain before purchase. Muti-layer Filtration System: Utilizing double filter components and a high density micropore filter, PETKIT filter unit rect remove pet hair and most other impurities, ensuring your pets always drink the most clean and fresh water. 5 Pack Individual Packaged Cat Fountain Filter: This product contains 5 pcs cat fountain filter replacement parts, each pet fountain filter is individually packaged, which effectively ensures the sealing of each cat fountain filter. Replacement: For your pet's health, please replace the filter every 2-4 weeks. The app will also remind you to replace the filter on time. We recommend that you clean the water fountain and replace water once a week in summer and every 2 weeks in other seasons, this will protect the water pump and filter. Attention: Please soak the new filter in clean water for at least 10 minutes before using. PETKIT Filter Unit Rect for EVERSWEET MAX Cordless Water Fountain, Replacement for 105 fl oz/3L Automatic Cat Fountain, 5 pack