For the development of 280 hectares of greenhouse horticulture Aqua-Terra Nova has developed two business cases for the re use of waste water for irrigation water. The two business cases both implemented the specific ambition for the region as well as the high demanded regional implementation. Based in the city triangle between Rotterdam - Zoetermeer and Gouda the developed concepts lead to inovative re use full filling the 100% recirculation of process, irrigation, drain and waste water.