beautiful. use a coil as the water conduit and make it a continuous process with total heat supplied to the volume part of an inexpensive? feedback loop.
How fast does the water evaporate ? Can oil or gas be floated on top to stop it?
Could one just put water in metal cans painted black? Had no idea it only took temps of 130F to kill the pathogens that harm.
There seems to be two bits of water involved, as you probably realize. One bit, several gallons, is sitting in a saggy plastic sheet, whose bulge forms a lens. You ask a good question, could one float a skin of oil on that to keep it from evaporating?
The bit that gets purified is in a separate container held (manually?) at the focal point of the water lens, and gets hot. But as the sun moves so does the focal point, so a very patient person has to be shoving the heating container along every few minutes. This doesn't seem very practical to me.
How fast does the water evaporate ? Can oil or gas be floated on top to stop it?
Could one just put water in metal cans painted black? Had no idea it only took temps of 130F to kill the pathogens that harm.