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A comment on ‘Two-faced’ membrane can create electricity from salty and fresh water. Parent comment

Re:‘Two-faced’ membrane can create electricity from salty an... by WJW on Saturday October 27, 2018 @11:33AM (#18316173)
That exists and is called reverse osmosis desalination.

https://en.wikipedia.org/wiki/Desalination#Reverse_osmosis

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