1-2 of about 2 matches for site:www.lowtechmagazine.com enter sewage
https://www.lowtechmagazine.com/2009/09/water-powered-cable-trains.htm...
thanks. The Fribourg cable train is the only zero-emission system powered by sewage, though. The Lynton
https://www.lowtechmagazine.com/2008/04/algae-fuel-biof.html
on a given surface. And since they are closed, no other organisms can enter. However, this method introduces