Wastewater reclamation and reuse have been practised in many parts of the world for thousands of years. Steady supply is the main advantage of reclaiming and reusing wastewater, usually for such reasons as water scarcity or environmental considerations. A second advantage is the efficient use of wastewater nutrients as a substitution for chemical fertilizers. Indeed, demonstration fields have shown that the yields of crops irrigated with wastewater is comparable to that achieved by chemical fertilizers. Typical reclaimed wastewater uses include unrestricted urban and recreational uses and agricultural irrigation of food crops; restricted-access urban use includes restricted recreational use and agricultural irrigation of non-food crops processed before consumption, and industrial reuse and recycling. In one case, the city of Windhoek, Namibia, reclaimed wastewater has been used to supplement potable water supply since 1968 (Metcalf and Eddy, 2003). In other cases, low-polluted wastewater or grey water is even used in aquaculture. Wastewater reuse is most common in Israel, where in some locations, 90% of wastewater is reused.