The article describes the project: “A Black Sea network promoting integrated natural Waste water treatment systems – WASTEnet,” which is dedicated to wastewater treatment systems. There is given a discussion of all types of Natural Treatment Systems, their specificity, chemical and biological processes which take place during their functioning. There is shown the impact of this Project and NTS on the example of ecology of Turkey and Georgia. The presented Project helps local and regional authorities and stakeholders to gain insight on the role of innovative and environmentally-friendly technologies, in improving the environment of the Black Sea region.