Reverseosmosis is the most favoured method, though, and in Israel and Algeria contracts have been signed for salt-free water at about 55 cents a cubic metre.
The conventional method involves boiling and then distilling water. An alternative works by reverseosmosis, in which water is forced through a semi-permeable membrane.
传统技术用的是蒸馏，新兴的替代技术是通过迫使咸水通过一个反渗透薄膜以达到过滤。
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Reverseosmosis desalination method is more wonderful.