This Dual Media 30k water softener two tank unit, model AMSP779-CBP, is designed for residential use applications. Watts activated carbon media for pre-treatment are highly popular because they correct a wide range of water quality issues by removing chlorine, taste, odors, organic chemicals, and sediment. These units use components that are NSF 61 listed. The state-of-the-art computer programming increases efficiency and saves salt and water. The W100SM series control valve is manufactured from high-tech materials, engineered and tested to perform in the most demanding environments for a highly reliable valve platform. The exchange media is a high-capacity cations polystyrene resin that combines high operating capacity with excellent chemical and physical stability for long dependable life. The resin tank features a non-corrosive fiberglass tank with a thermoplastic inner liner. The brine tank is a combination brine maker and salt storage vessel and is made of tough, corrosion free, high-density polyethylene. All surfaces contacted by water are made from 100 percent polymer components.