The OptiSoft Water Softener Model OS.13 is designed to remove or reduce calcium and magnesium “hardness” minerals from water eliminating problems associated with the formation and accumulation of scale deposits. Scale forming minerals can be removed through ion exchange. For applications where a managed amount of hardness minerals is desired, the OptiSoft OS.13 is equipped with precision blending allowing the operator to reliably customize the amount of hardness in the treated water. The system utilizes an electronic controller for simple set-up and user interface. The OS.13 is suitable for both cold and/or hot water up to 149°F.