1 University of Vienna, Department of Environmental Geosciences and Environmental Science Research Network, Althanstrasse 14, UZA2, 1090 Vienna, Austria.
2 DVGW-Technologiezentrum Wasser (TZW), The German Water Centre, Karlsruher Str. 84, 76139 Karlsruhe, Germany.
3 University of Vienna, Department of Environmental Geosciences and Environmental Science Research Network, Althanstrasse 14, UZA2, 1090 Vienna, Austria. Electronic address: thilo.hofmann@univie.ac.at.