Hong Kong has been successfully using sea-water extensively for toilet flushing for more than four decades. The dual water supplyrnsystem is seen as an effective way to conserve water. At present, seawater is already available for toilet flushing in metropolitan areas and most of the new towns, covering about 80% of the population. WSD in Hong Kong has been planning for an extension of the use of seawater for toilet flushing whenever it is economically justified. In such away, substantial amounts of freshwater can be saved.
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