Green roofs are becoming increasingly popular because of the many advantages they have in terms of energy, cooling, clean air and rainwater. Green roofs retain a lot of rainwater and evaporate it through the plants. The surplus rainwater can also be perfectly reused for flushing the toilets, for cleaning and for the garden.

When reusing the rainwater, it is decoloured by an active carbon filter and, if necessary, micro-organism-free with membrane filtration. In case of heavy rain showers, the excess rainwater can be infiltrated into the soil.