Product Description This CF replacement filter is only compatible with Waterdrop N1 countertop reverse osmosis water filtration system.The CF filter is made of carbon block and pp cotton as the main filter materials. Waterdrop adopts selected carbon block to effectively reduce fine sediment, chlorine, bad taste and odor, heavy metals (lead, mercury, etc. ). The high-grade PP cotton can stop large particles including limescale and heavy metals. Clean and pure-tasting water is always within reach with Waterdrop.The CF replacement filters do not require tools or expert plumbing skills to install. You only need just 3 seconds to replace the filter cartridge.It is recommended to replace the CF filter with a new one every 6 months. We base this recommendation on the usage and local water quality – both factors determine the cartridge lifespan. Kindly note that prompt replacement ensures optimal filtration performance.Plastic bottles take hundreds of years to decompose. Waterdrop helps to reduce plastic waste.