Israeli Ashkelon Desalination Plant:

http://www.youtube.com/watch?v=9bUCH-HyCek&feature=related

How Membrane Filters Work:

http://www.youtube.com/watch?v=M3mpJysa6zQ&feature=related

Reverse Osmosis:

http://www.youtube.com/watch?v=BeXHKpuHVZg&feature=related