The reverse process is called desalination, and there are a few approaches to desalination that use membranes: https://en.wikipedia.org/wiki/Desalination https:

The reverse process is called desalination, and there are a few approaches to desalination that use membranes: https://en.wikipedia.org/wiki/Desalination https://en.wikipedia.org/wiki/Desalination Typically, you don't use electricity directly, but pump in salt water with high pressure, and some of the water is pushed through, while the salt remains.