Ceramic Water Filter
- Ronald "Ron" Rivera (1948–2008) invented an inexpensive ceramic water filter used to treat gray water in impoverished communities. He established community-based factories to produce the filters around the world.
- The filter has been cited by the United Nations’ Appropriate Technology Handbook, and tens of thousands of filters have been distributed worldwide by organizations such as International Federation of the Red Cross and Red Crescent, Doctors Without Borders, UNICEF, Plan International, Project Concern International, Oxfam and USAID.
- Angel Torres-Collazo of Guaynabo, Puerto Rico, developed a big water floating strainer that is constructed with a rectangular frame. According to the U.S. Patent & Trademark Office: "A cylindrical drum is attached to each corner of the rectangular frame. Below the rectangular frame, a box-strainer is fixed. The distance between the box-strainer and the rectangular frame is adjustable so that the level at which water is drawn can be raised or lowered."
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