By creating nanopores in graphene (pictured below), silicon atoms are able to stabilize the structure and filter water through the porous membrane, removing the salt and many other contaminants. This is a groundbreaking method of desalination, 100x faster and at 1% of the energy cost. It is also less than a nanometer thick, while the old filters were over a foot in thickness.
It's about time we made sure we had unlimited water; graphene has immensely versatile properties and is extremely cheap to manufacture. It's the thinnest material on the planet, more flexible than rubber, but stronger than diamond, 300x stronger than steel.
Though these guys are have stilted dialogue at times, they are dropping madd knowledge bombs about graphene filtration
Robert Murray Smith demonstrates the power of graphitic sand as a water filter
http://phys.org/news/2015-03-desalination-nanoporous-graphene-membrane.html
Imaged Credit: http://phys.org/news/2012-06-nanoporous-graphene-outperform-commercial-desalination.html