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In page Water supply and sanitation in Hong Kong:

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Desalination was a source of water in Hong Kong between 1975 and 1981. A large desalination plant was commissioned in Lok on Pai in 1975, but was decommissioned again in 1981 because its operation was more expensive than importing water from Dongjiang.[1] Another pilot desalination plant utilized reverse osmosis in Tuen Mun in Hong Kong during the year of 2004, but this plant lasted only one year. This plant was made as an experiment to witness the efficiency of reverse osmosis. Desalination is an intriguing topic that would definitely increase the rate at which clean water can be supplied as well as help prevent the overuse of water pipes for transportation, but it is an expensive process that currently does not yield too many benefits.[2]