Addendum: if you have more ...
Published by Thomas Helle, CEO at Novis
Addendum: if you have more time, you can construct a wetlands.
We have had the experience of a wetland on the roof (!) of a building in Germany. All water from showers and toilets (!) was running through. At the end of the approx. 15 m wetlands the water has a high drinking quality, outperforming the German standards for drinking water.