Latewood is absolutely right :thumbsup: NFT's irrigation is constant,24/7, roots receive virtually all the oxygen they need to absorb the nutrient solution. Growth is super fast when everything is right on the money. NFT offers no buffering ability. Since there isn't growing medium, roots MUST be kept perfectly moist by the nutrient solution all the time. If a pump fails, roots die. It's a good system but make sure evrything is funtioning properly.