Every time I look at large scale aquaponics setups it looks like they are using some other technique to supply the plants with nutrients other than a ebb/flow with clay balls. For a quick example and for anyone who missed it this was on MSNBS a few nights ago. Short but fun coverage for aquaponics.

http://www.msnbc.msn.com/id/21134540/vp ... 6#40203746

They load the lettuce into a tray and put them into their grow beds. Now do you think they flood those grow beds once an hour to feed the plants? Do you think they are using sprayers as a nutrient film technique (NFT), do you think they are doing deep water culture where the bed is continuously flooded and they are continuously pumping air into the water to provide o2 to the roots?

Maybe a DIY aquaponics place isn't where I should be looking. I really want to study commercial setups.

Thanks Guys.