
Making seawater drinkable for the millions without access to freshwater is a noble idea, but a standalone desalinator needs 17 gallons of diesel fuel and 66.5 kilowatts of electricity to make 1,000 gallons of freshwater. The Solar Cube, made by Spectra Watermakers in California, churns out 1,500 gallons of drinking water on just 22 kilowatts of its own solar and wind power. The innovation is a pump that triples efficiency by recapturing hydraulic pressure during the filtering process. Solar Cubes are now bringing freshwater to remote regions of South Africa, Pakistan, Venezuela, Chile and other places short on infrastructure and electricity.
single pageFive amazing, clean technologies that will set us free, in this month's energy-focused issue. Also: how to build a better bomb detector, the robotic toys that are raising your children, a human catapult, the world's smallest arcade, and much more.


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