In 2001, after years of development and extensive field testing, Clack introduced its first line of residential control valves. The goal was to design a family of control valves for the water treatment professional that covered the greatest range of applications, while having the greatest commonality of parts. The WS1 series valves were designed with the world’s water treatment professional in mind, and incorporate many features that are a direct result of feedback from customers. The WS1 valves are manufactured from composite plastics and are designed to provide high flow rates (up to 27 GPM) over a wide range of applications. This provides water treatment professionals a great deal of flexibility in system design and greatly reduces inventory requirements. The commercial/industrial line of control valves was also developed with direct input from customers and incorporate many of the features proven in the residential line of valves. The WS1.25 valve provides flow rates up to 34 GPM, our WS1.5 valve provides flow rates up to 60 GPM, our WS2 valve provides flow rates up to 115 GPM, the WS2H valve provides flow rates up to 125 GPM and the WS3 provides flow rates up to 250 GPM. All Clack valves incorporate patented “stack technology” and feature state-of-the-art electronics and programming software.