COMPATIBILITY: Our cat water fountain filter is compatible with 2L/2.5L Cat Drinking Fountain, Running Water Fountain Multi-Filtration System: Make pets happy with their drinks. This replacement filter consists of a cotton layer, activated carbon and ion exchange resin. It removes hair, debris, odors and other impurities so that the water always tastes fresh and clean. Sponges also prevent debris from clogging and damaging the pump, extending its working life Pump Hose Replacement: After being soaked in tap water for a long period of time, the water pipes will develop limescale, clogging the pipes and reducing the flow of water. And the water pipe will be yellow, affecting the quality of the water, which in turn affects the health of your pet Frequency Of Replacement: Please soak the filter in water for 5 minutes before use and rinse thoroughly under running water. Replace the cat water dispenser filter once in 1-2 weeks in summer and once in 2-4 weeks in winter to ensure clean drinking water. More frequent changes if more than one pet is using the water fountain What You Will Get: This filter replacement set includes 12 packs of replacement filters and 3 hoses. Please check it when you get our package 💦【COMPATIBILITY】: Our cat water fountain filter is compatible with 2L/2.5L Cat Drinking Fountain, Running Water Fountain;