I am no expert, but I think I have seen such a thing about 10 years ago and this article doesn't explain how it would be any different.
Also, here's why this thing, even with the technology completely perfected (100% efficiency), would be absolutely terrible: You're turning valuable fresh water into mostly unusable salt water.
Also, here's why this thing, even with the technology completely perfected (100% efficiency), would be absolutely terrible: You're turning valuable fresh water into mostly unusable salt water.