Pakistan, Oct. 23 -- China is expanding its water technology industry as shortages put pressure on natural freshwater supplies. Chinese companies are selling desalination membranes, filtration equipment and engineering services to water-stressed countries across Asia, the Middle East and Africa. They are supplying projects in Egypt, Saudi Arabia and the United Arab Emirates. Many projects receive support through the Belt and Road Initiative, which connects Chinese investment with overseas infrastructure development.

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China's water technology exports have grown steadily in recent years. According to UN Comtrade, the country exported more than $2 billion worth of wa...