Water Disalinization

One of areas of research going on right now is water disalinization. So we pump sea water up to a high level, and an the drain system for that to lower it back down again. The reverse asomosis filter uses gravity to extract the fresh water. Another one has to do with not storing water, but storing compressed air. But they make sense at a grid level. They need to be ge they need to be professionally operated and maintained.