We have been more and more focusing on ecology and sustainability in our projects. That is why we visited Michal Šperling, who is one of the best experts on root zone water treatment (www.korenovky.cz). He explained to us the principles and technology of recycling of wastewater in his house. We were surprised, that the technology is not complicated and requires very little maintenance. The result is that the most of wastewater is recycled in roots of the greenery. The benefit for the environment is incredible. Side effect is that the neighbours have a very nice view on the roof garden.