【COMPATIBILITY】: Our cat water fountain filter is compatible with 3L Flower Cat Drinking Fountain, Running Water Fountain; 【Triple Action Fountain Filter】: This replacement filter consists of a layer of cotton, activated carbon and ion exchange resin. It removes hair, debris, odors and other impurities so that the water always tastes fresh and clean; 【Pre-filter Sponges】: The sponge can prevent debris from clogging and damaging the pump, extending its service life; 【Change the filter regularly】: Please soak the filter in water for 5 minutes before use and rinse it thoroughly with running water. Replace the cat water dispenser filter once every 1-2 weeks in summer and once every 2-4 weeks in winter to ensure clean drinking water. Changes are more frequent if multiple pets use the fountain; 【WHAT YOU WILL GET】: Included 8 packs of replacement filters.