"The Onil Stove. Better than a 3 stone fire for sure! It seems quick and easy to put together. I think I'm suppose to be amazed, but I don't find it as impressive as, say, the Justa stove. Or the impressive Uganda stove.
While trying to find a method for aerating water without energy input, Austrian engineer Franz Zotlöterer stumbled across the idea of a mini-power plant which is simple to construct and has a turbine efficiency of but which is safe for fish due to