Compatibility: Our cat water fountain filter is suitable for 2L/3.2L/4L stainless steel faucet cat water fountain models. Buy our filters with confidence because we are the original manufacturer of fountain filters. High quality cats. Don't worry about the size, it fits perfectly with the stainless steel cat fountain models listed above. 【Package List】 The package contains 12 carbon filters and 12 foam sponges. 【Triple Filtration】 The replacement filter element of the water dispenser is composed of multiple layers of activated carbon and high-quality 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 Replacement: The pet water fountain carbon filter should be replaced every 4 weeks. (The weather is hot and bacteria are more likely to breed. Please replace the