Sure, but water recycling is even more efficient. You can extract pure, drinkable water from used shower water, or even toilet water, using much less energy than it takes to remove sea salt (since you're fighting a much gentler osmotic gradient).
Psychologically though, I think most people prefer the idea of purified sea water to purified toilet water ... even if the sea is a toilet for everything that lives in it!
Psychologically though, I think most people prefer the idea of purified sea water to purified toilet water ... even if the sea is a toilet for everything that lives in it!