A new "tea bag" uses nano-fibers to suck contaminants and bacteria out of water, providing a desperately-needed, cheap solution for the billions of people without clean drinking water.
This tea bag was made from the same material used for the bags of the country's popular rooibos tea. Inside the sachets are two tiny destroyers of all things unsafe: ultra-thin nanoscale fibers, which filter harmful contaminants, and bacteria-killing grains of carbon.

In order to purify the water, the user needs to place the tea bag in the neck of a water bottle. The tea bag filters the water when the person drinks from the bottle. . A single bag can filter up to a liter of even the most heavily polluted water. The bags are thrown away once used.

One bag can be used to filter up to 1 liter of water and it costs less than a half of an American cent.

This is the result of a project made by Stellenbosch University.