Nik Bertulis is a permaculture water educator, a designer of integrated water systems, implementing greywater, rainwater, stormwater and wetland systems. He cofounded Dig.coop a water conservation systems cooperative. He has designed many innovative water solutions for our environment. We talk about the importance of closing the nutrient cycles in our environment. What our society considers waste, our pee, our poo, our sewage, can be useful nutrients for the vegetation and soil. The distribution of pee and poo of animals moving around support the functioning of our ecosystems. Nik discusses how we can clean our sewage with nature’s natural biology and wetlands rather than with synthetic chemicals.