1. 30/3/2017 ECHOregularly publishes agriculture technical notes to address important agriculture development issues. Here is a short excerpt from a tech note on Biosand Water Filter. It is available on ECHOcommunity.org (http://edn.link/biosandwaterfilter).
  2. 28/10/2014 Access to clean drinking water remains one of the greatest challenges in the world. The BioSand Filter is one method that can be used for purifying water at the household level. With this filter, contaminated water is filtered through a natural biological layer and then layers of sand, pebbles...