How does that work again?

In a NFT (Nutrient Film Technique) system the plants are put in a channel (usually flat bottomed for a purist) and nutrient is pumped to the end of the channel and flows by gravity back to the tank. In the detail at the right you see the way I mount my channels. There is a 3/4" thin walled conduit pounded into the ground for primary support and then a piece of 1/2" conduit is dropped in on which a little pedestal is mounted which has a carriage bolt through it. A 3" hold is drilled in the channel where the plant is mounted. A parallel PVC tube carries the nutrient to the end of the channel where it is fed in with a 1/4" tube into a drilled 6mm hole. Works well!