A diffusion based controlled release technology is now being used as a method to introduce
chemistry into an open recirculating cooling system. Controlled release technology applied to a cooling
tower water treatment program enables accurate delivery of chemistry without the use of mechanical
pumps or handling of liquid chemicals. Our laboratory work examined how factors such as formulation,
temperature, flow, and coating weight affect this feed method. In addition to the technology overview,
case studies of current applications will be presented.