This may or may not add to this conversation...glad if it does and my apologies if it does not.
http://livingmachines.com/Home.aspx
Living MachineĀ® Technology blends cutting-edge science and engineering with plants and beneficial bacteria to efficiently treat
and
reuse wastewater, providing lasting water solutions for communities everywhere.
Based on the principles of wetland ecology, our patented tidal process cleans water, making the Living MachineĀ® the
most energy-efficient system to meet high quality reuse standards. The Hydroponic Living Machine has withstood
the test of time, with systems remaining in operation for close to two decades.