The old wastewater treatment works at Waterval Prison near Utrecht in KwaZulu-Natal was repaired and upgraded under a contract managed by Virtual Consulting Engineers. The new design included an additional bio-filter, two humus tanks – which were not part of the original design – as well as the construction and lining of new maturation ponds. Electrical infrastructure and mechanical equipment were also repaired and recommissioned. During the repair phase, a set of Operation and Maintenance Manuals was developed. This enabled an operational phase as part of the project, during which Enviro Metsi was responsible for process control, operation and maintenance of the works, and ultimately, ensuring effluent quality compliance.