We built this system on our Aquaponics plant tunnel as we had some space to spare.. The system uses only a 100 watt airpump to lift water to a height of 1.3 metres. Everything else is gravity fed. No water pump is used in the system, reducing the cost of electricity. Up to 740 lettuce can be grown on a 46 week cycle. More info here http://bit.ly/29MMw9w

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