For Hong Kong, like other densely populated areas, handling sewage is a challenge, especially with an aging infrastructure. The network involves about 900 miles (1,448 km) of pipelines going to 280 treatment facilities, processing over 700 million gallons (2.6 billion L) of sewage per day.  Maintenance is critical and ongoing.

Instead of patching existing problems or completely rebuilding manholes and other parts of the system, we proposed a long-term solution using our polyurea spray coating method to stop deterioration and strengthen walls.  This entailed working with a contractor who did pipeline repair in the region.