Aquaponics at full capacity: 200 tilapia producing waste that feeds nitrogen to 40m² of leafy greens and herbs. Water use: 10% of equivalent soil-based growing. No synthetic fertiliser. Fish fed on duckweed grown in a separate tank on waste water. Closed loop food production in 80m² of urban space. #Aquaponics #UrbanFarming #CircularAgriculture