WEST is a powerful and user-friendly tool for dynamic modelling and simulation of wastewater treatment plants (WWTP). The extensive state-of-the art model and process library of WEST enables you to model and evaluate almost any kind of modern WWTP. WEST is designed for engineers or professionals who want to simulate processes where physical, biological or chemical processes take place in water. With a mathematical model of a WWTP you will have the possibility to test any scenario of interest and to track the associated treatment efficiency as well as operational cost.