One of the key strengths behind a sustainable aquaponics system, the growing of fish and plants together within a mutually supporting system, is the notion of increasing natural efficiencies. The fish waste is recycled through the roots of growing plants to provide the nutrients for the plants to grow properly. The waste water is filtered to remove the solid waste materials, and where there are no chemicals (including antibiotics for the fish), synthetic fertilizers, and other toxic pollutants added into the system, the filtered waste can be recycled onto lawns and other garden areas asnatural fertilizer.
Via A.W. Ford