Sand is a cheap and easy to find water filter. It's also not a very good water filter. But a new development--coating sand in graphite--could make it possible for everyone in the world to have easy access to clean water.
Nearly one billion people lack access to safe drinking water. There are creative ways to purify dirty water when a Brita isn't handy, to be sure--people living in areas with plentiful sand, for example, can pour water through sand and pebble-filled filters. But while the sand quickly filters water and removes large particles, it is, not surprisingly, ineffective at removing heavy metals, pathogens, and other toxins that find their way into dirty water.
To read the full, original article click on this link: How "Super Sand" Could Provide Drinking Water To Millions Of People | Fast Company