This is an NFT system. Nutrient Film Technique, also known as Nutrient Flow Technique. There is a pump in a nutrient sump that pumps 24/7. First, the pump pushes the water to the start of the Tube..then..the water flows down into a drain that returns to the sump. The water in the Tube(fencepost) is about 2 inches deep and flows however fast i want it to because of the valves. The roots dangle into the constantley moving solution and grow like mad.

Payn, just make sure that filter wont filter out your nutes. And yes its a recirculating system..which is known as an NFT system.
NFT Nate Reviewed by NFT Nate on . New Hydro System You guys/gals might be interested in my new Hydro system. Its made with 5x5vinyl fence post with 3 3" holes in the top. This is an NFT system that has a stand that is made with 3/4" pvc tubing. It has a 396gph pump that pumps the nutrient into 2 4' sections. Check out the pics to see what I mean. Rating: 5