A nutrient film technique (NFT) system moves a thin film of nutrient solution along channels that hold the roots. A pump lifts the solution from a reservoir and lets it flow back down.
The main parts
A reservoir, a pump, a feed pipe, the channels with net cups, and a return to the reservoir.
Slope
The channels need a slight slope so the solution flows steadily. The exact slope depends on the channel and your set-up, so follow the manufacturer’s guidance.
Keep the pump running
NFT depends on a continuous flow. If the pump stops, roots can dry out quickly. Many growers use a backup power source or an alarm for this reason.