Below is a great hydroponics set up that a client of Wichita Rain BArrels has done. He has had great success with it. Here is a bit of info he sent me.
" These pics are a few of my proto-type gardens I built myself. Not prettiest things in the world but they save on maintanence (weeding, daily watering, etc.). I never have to do anything but look under the lids and make sure the water level is up to par.
NFT (nutrient film technique) system