Off the coast of North Carolina, two friends are developing a new way to desalinate water—a notoriously high-energy, high-cost process. Their solution: use the power of the ocean itself to clean the water of its impurities.Justin Sonnett and Chris Matthews first came up with the SAROS desalination buoy while at the University of North Carolina at Charlotte. They’ve since set up a company and worked on their floating prototype for more than two years. Now, they’re looking for support on Indiegogo.