1. eThekwini Water and Sanitation, 3 Prior Road, Durban 4000, South Africa
2. Discipline of Public Health Medicine, School of Nursing and Public Health, University of KwaZulu-Natal, Durban 4041, South Africa
3. Eawag, Swiss Federal Institute of Aquatic Science and Technology, Überlandstrasse 133, Dübendorf 8600, Switzerland
4. Pollution Research Group, School of Engineering, University of KwaZulu-Natal, Durban 4041, South Africa