tiny device grabs more solar energy to disinfect water faster /

In many parts of the world,the only way to create germy water secure is by boiling, which consumes precious fuel, and by putting it out in the sun in a plastic bottle so ultraviolet rays will kill the microbes. But because UV rays carry only 4 percent of the sun's total energy,the UV method takes six to 48 hours, limiting the amount of water people can disinfect this way.

Source: phys.org