Superb Filtration Performance With its first stage, a 2-in-1 composite Sediment and Carbon Block filter, second-stage featuring an advanced RO Membrane, the RO500AK-BN effectively removes up to 99% of over 1,000 contaminants, including lead (up to 98% removal), chlorine, fluoride, arsenic, asbestos, calcium, sodium, and more. In the third stage, a Carbon Alkaline Filter made with high-quality coconut shell activated carbon and minerals further polishes the filtered RO water, balances pH levels, and enhances taste by adding essential minerals back into the water. Individually wrapped 2-year high capacity filter replacement cartridge pack for RO500AK Tankless RO Reverse Osmosis Water Filtration System. Material: ABS Plastic.