CompatibilityOur cat water fountain filter is suitable for 2L/3.2L/4L stainless steel faucet-shaped cat water fountain models. Buy our filters with confidence because we are the original fountain filter manufacturer. High quality cats. Don't worry about the size, it fits perfectly with the stainless steel cat fountain models listed above. Package ListThe package contains 8 carbon filters and 8 foam sponges. < li>Triple FiltrationThe water dispenser replacement filter is made of multiple layers of high-quality activated carbon and cotton to form a triple filtration system, which can effectively remove hair and heavy metals and improve the taste. water. Allowing your pet to drink clean, fresh water throughout the day will increase their water intake and reduce the risk of urinary tract infections. Regular ReplacementPet water fountain carbon filters should be replaced every 4 weeks. (In hot weather, bacteria are more likely to breed. Please replace the activated carbon filter from time to time. Every two weeks and foam filter every two months to keep the water fresh. Warm TipsFor Avoid activated carbon dust (which will not harm your pets) falling into the water, please soak the filter in water for 5 minutes before use, then rinse thoroughly under running water.