The Waterdrop WD-C1RF Filter with RO membrane is a premium water filter designed for household use. It is a replacement filter for WD-C1S and WD-C1H models, featuring a reverse osmosis filtration method to remove contaminants such as TDS, PFOA, PFOS, chlorine, fluoride, arsenic, and lead. Made of PP cotton, carbon fiber, and a reverse osmosis membrane, this white filter ensures clean and safe water for your kitchen. With its high-quality materials and efficient filtration method, the Waterdrop WD-C1RF filter is a reliable choice for pure and refreshing drinking water.