NFT Hydroponics Systems work by generating a constant water flow at the plants' root systems which are suspended in a tub. The slow moving water solution is spread out across a flat surface at a depth of approximately 1 to 3 inches. This shallow solution depth is constantly maintained to create a nutrient film over the plant roots.
When setting up your own NFT system you will need a shallow, flat-bottomed tub and a submersion pump which will keep the water flowing over the plant roots. The plants should be placed close together in order to enable the nutrients to more readily cling to the roots. The submersion pump will constantly recycle the water back into the system. And because the water is being constantly recycled, you will need to closely monitor the nutrient levels in the water.