1、Filter Works Like a Charm:Fountain filter features the strongest purification that a common one cannot live up to, which just catches the larger, but it can catches everything, let alone to filter out dust, hair and heavy metals. Water purified by filter has an improved taste of being cleaner and fresher, it encourages your cats used to refuse to water, now to fall in love with drinking, accordingly, to reduce the risk of urinary tract infections and kidney issues.2、PERFECT MATCH: Cat Water Fountain Filter compatible with most 102oz/3L Round Pet Fountain,Pack of 10 filters.3、KEEP YOUR PET HEALTHY : Every filter for cat fountain is composed of a cotton layer, activated carbon, and an ion exchange resin. It can effectively remove impurities, filter hair, chlorine, heavy metals, and odors. Get high-quality drinking water , Helps to increase water consumption and reduce the risk of urinary tract infections, make pets live longer and healthier.4、FREQUENCY OF REPLACEMENT : We suggest to replace the pet fountain filter 2-4 weeks to keep the water fresh and clean5、NOTE WARRANTY : To help prevent the charcoal dust from shedding, please rinse the replacement filters for cat fountain/dog water dispenser with water thoroughly before use, providing the clean water for cats and dogs.