I tried to create an auotmated system of sorts. I use pumps to feed the plants on a drip system using 25 gallon tanks underneath the beds. I have float valves that keep the tanks filled. I find that pumping out the tanks every 6 to 7 days and changing the nutrients is good for 25 gallons.

http://i965.photobucket.com/albums/a...fromme/005.jpg
Here is bed 4 ready to take new plants. The spagetti tubes arree just hekd into place for now with clothespins. The underside is actually another bed without the drainholes drilled. I found this would allow me nore vertical space for the plants above..



Here is picture of the float valve under the tank. I move the underneath tank out for easy acess when I change nutrients.



Not so good a picture but perhaps you can see the tubes pumping out water and nutrients here. I split the tubes to cover the clay pelets.