So the first stop on our tour of Berlin (which included me, Prof Koehler, a group from Texas A&M, and a special media-capable guest from NYC) was the block 6 on the old outskirts of w. berlin. For over 20 years (off and on due to some challenges and renovations) this block of high rises has been recycling its greywater for toilet flushing.
In the 1980s, as part of an initiative sponsored by the city of berlin, the water was is treated in the remedial wetland. Today, this wetland treats roof runoff (I think these roofs are also "green"), and a small decentralized treatment plant is used for the greywater. The plant has a greenroof shown here (behind the wetland)to the right and in this brochure
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