Natural
Sewage Plant (NSP) Typ 4 ...
... also needs only 2 m² per person, but treats only the waste water from
the kitchen, shower, wash basins, washing machine, dishwasher etc., but does
not include human waste.
This means that a dual pipe-system is required, one for the waste water and
one for the soil.
Human waste water is chanelled into the municipial sewage system. The remainig
waste water passes through a Natural Sewage Plant and, once treated, can be
used for irrigating gardens and parks.
