A growing number of countries are confronted with the challenge of providing sufficient water of appropriate quality for industry and domestic consumption.A major approach to reach this goal is based on water saving and protection of existing resources.This means that it is not only necessary to develop more sophisticated treatment strategies for different kinds of aste water,also the discharge of waste water during industrial processes must be reduced by careful usage of clean water.One option to support sustainability in this respect is to exercise source control.In many processes chemical or biological components are used in excess to guarantee desired results.