?Wide Compatibility?Cat water fountain filter (square) is designed compatible with Rellaty's 108oz/3.2L Pet Water Fountain and other fountains with same volume and style.Package includes 4 pack of pet fountain replacement filters. They are individually packaged and sealed to maintain high quality. | ?Triple Filtration System?Cat fountain filter is composed of activated carbon, ion resin and non-woven fabric. They can filter hair, heavy metals, dirt and other impurities, keeps water tasting fresh and clean all the time.They help pets drink more water and reduce the risk of urinary tract infections. | ?Keep Healthy?The fountain filter removes any dirty impurities and unpleasant odors, ensuring that your pet gets the clean water it needs for daily health. Pet water fountains are a great way to keep your pet hydrated and healthy. Also, pre-filter sponge around the pump to better filter impurities and extend the life of the pump. | ?Usage Recommendations?To prevent the activated carbon dust (which will not harm your pets) from shedding into the water, please soak the filter in water for 2 minutes and rinse it thoroughly under running water before use. According to your pet's drinking frequency and the number of pets using the fountain, change the filter every 2-3 weeks. | ?24/7 Customer Service?Please know that, every product purchased from Rellaty comes with a 24/7 friendly customer service, so whenever you have a question, please feel free to contact us, we will solve your problem within a day!