While many places in the world are still using fresh water for toilet flushing, Hong Kong has been extensively adopting seawater for flushing since the 1950s, covering about 85 per cent of its population.1 This allows the precious fresh water to be preserved for potable purposes.

Aerial photograph showing the development in the area, taken in April 2023. Lawson Solution/ < > < > < >

However, such a system is not easily applicable for sites at high altitude or remote from the seashore. This is the case for the Anderson Road Quarry (ARQ) site—a former quarry spanning over 40 hectares—set to be redeveloped into a new town to serve a population of about 30,000.

Located ...


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