Ecofiltro

One of the first things often done by 
development workers for impoverished people is to dig a well for them, fresh & safe water being a primary concern. Easy to take for granted if you live in a more 
prosperous country.

 A company in Guatemala has taken on  the demand for drinkable water. They came up with a method to get an effective water filter out to the rural poor in a way the people can accept and can afford.

The product and the name of the company is Ecofiltro, and that's their mission. 

Clay and sawdust make up the structure of the filter, and colloidal silver (kills bacteria with no side effects) coats it.

So bacteria, taste, and odor are removed and water-borne disease is prevented. Clean water should not be just a charitable gift,  but (in the company's words) a "sustainable solution" that provides "access to safe water for the rest of their lives."