The central connecting element of the ecological settlement is the handling of wastewater. The houses are not connected to the public sewer system, but have a connection to the settlement's own biological sewage treatment plant (STP) for the gray water (so the domestic sewage without faeces).
The Allermöhe ecological settlement is one of the pioneers of ecological settlement construction in the Federal Republic of Germany and was the first ecological settlement in Hamburg.
A case study of our settlement can be found on the project website of the "sustainable sanitation alliance" which includes also a PDF summary download.