The Deep Flow Technique (DFT) is a variant of the Nutrient Flow Technique (NFT). Unlike in NFT, where a thin film of nutrient solution passes through the roots, the roots of the plants in DFT systems are rather surrounded with a larger volume of nutrient solution (as much as 4 cm thick). This large volume nutrient, surrounding roots in the DFT system protects roots from drying even in case of pump failure and thus is much safer than NFT.