The Holy Grail

In California, they have had to outlay $1 billion for a conventional desalination plant.  They need more than one, another fourteen are in the works.

"The holy grail for water researchers and engineers is a desalination process that is energy-efficient, environmentally friendly and relatively cheap. The tantalizing promise of desal means that a lot of people are working on finding that elusive prize, with some promising early results."

http://nextcity.org/daily/entry/drought-resilience-desalination-plant-california

http://www.ibtimes.com/california-s...s-only-solution-despite-environmental-1640292