The specification discloses a hydroponic nutrient aeration and flow control(NAFC) deviceand system, which both aerates and controls the flow of the hydroponicnutrient solution.The NAFC device has no moving parts. Each NAFC device mixes and aerates thenutrientfrom the nutrient reservoir with air and/or nutrient from one of the growtanks. Each NAFCdevice additionally controls the flow of the aerated nutrient solution to thegrow tank andthe nutrient reservoir. The vertical position of the end of the nutrientreturn line in eachgrow tank may be adjusted to adjust the level of the nutrient solution withinthe grow tank.
