A hydroponic nutrient circulation system comprising: a nutrient reservoir ; a plurality of grow tanks ; a nutrient supply system for supplying nutrient from the nutrient reservoir to the grow tanks , the nutrient supply system including a nutrient supply line extending into each grow tank ; a nutrient return system for returning nutrient from the grow tanks to the nutrient reservoir , the nutrient return system including a nutrient return line extending into each grow tank ; and a plurality of nutrient aeration and flow control, NAFC, devices , each NAFC device associated with the nutrient supply line of a respective one of the grow tanks , each NAFC device including: a nutrient supply intake to which the nutrient supply system is connected; an air intake to which the associated nutrient return line is connected; a nozzle in fluid communication with the nutrient supply intake ; a mixing chamber in fluid communication with the nozzle and with the air intake ; a receiver port in fluid communication with the mixing chamber and aligned with the nozzle ; a bypass chamber surrounding the receiver port , the bypass chamber in fluid communication with the mixing chamber ; and a grow tank supply outlet to which the associated nutrient supply line is connected, the grow tank supply outlet in fluid communication with the receiver port . a nutrient reservoir ; a plurality of grow tanks ; a nutrient supply system for supplying nutrient from the nutrient reservoir to the grow tanks , the nutrient supply system including a nutrient supply line extending into each grow tank ; a nutrient return system for returning nutrient from the grow tanks to the nutrient reservoir , the nutrient return system including a nutrient return line extending into each grow tank ; and a plurality of nutrient aeration and flow control, NAFC, devices , each NAFC device associated with the nutrient supply line of a respective one of the grow tanks , each NAFC device including: a nutrient supply intake to which the nutrient supply system is connected; an air intake to which the associated nutrient return line is connected; a nozzle in fluid communication with the nutrient supply intake ; a mixing chamber in fluid communication with the nozzle and with the air intake ; a receiver port in fluid communication with the mixing chamber and aligned with the nozzle ; a bypass chamber surrounding the receiver port , the bypass chamber in fluid communication with the mixing chamber ; and a grow tank supply outlet to which the associated nutrient supply line is connected, the grow tank supply outlet in fluid communication with the receiver port . a nutrient supply intake to which the nutrient supply system is connected; an air intake to which the associated nutrient return line is connected; a nozzle in fluid communication with the nutrient supply intake ; a mixing chamber in fluid communication with the nozzle and with the air intake ; a receiver port in fluid communication with the mixing chamber and aligned with the nozzle ; a bypass chamber surrounding the receiver port , the bypass chamber in fluid communication with the mixing chamber ; and a grow tank supply outlet to which the associated nutrient supply line is connected, the grow tank supply outlet in fluid communication with the receiver port . <EOS>