Hydroponics

ARTIFICIAL WETLANDS
http://ceeserver.cee.cornell.edu/mw24/enveng/artificial_wetlands.htm

http://www.gardening.cornell.edu/factsheets/growflow/
how to build

http://www.news.cornell.edu/stories/Feb09/RikersHydroponics.aa.html
learning to use hydroponic system (article)