Duplex softeners, which are equipped with duplex valves, provide softened water around the clock. Each softener comes with two bottles of resin. If one of these bottles is saturated, control switches to the other bottle. Meanwhile, the saturated bottle is regenerated so that it can be used again. the duplex softener assures a 24h/24 supply of soft water to the appliances or machines placed after the softener. A duplex system is therefore indispensable if you need a constant supply of soft water or if you need to prevent the devices placed after the softener (boilers, cooling towers, dishwashers, etc.) from coming into contact with hard water.