UPDATE RE ABOVE

Another reason not to use reverse osmosis plant on land.
Such equipment requires several gallons of sea water for each gallon of drinking water produced.
This matters not on a yacht or ship surrounded by infinite supplies of sea water, but would be a serious drawback if had to carry the water from the sea to a coastal home.

Reverse osmosis watermakers take in seawater and produce a small amount of drinking water, and a much larger amount of slightly more concentrated brine, which is returned to the sea.
Engine driven machines also use this water for cooling.