the BioSand Water Filter
The BioSand Water Filter is an award-winning Canadian water filtration technology developed by Dr. David Manz, a former University of Calgary professor. BioSand Water Filters are an adaptation of slow-sand filtration, designed for use at the household level. The filter removes water-borne bacteria, viruses, protozoa, and other organisms that cause diseases such as cholera, typhoid fever, and amoebic dysentery. The filter also strains out the particles and organic matter that cause cloudiness, unpleasant taste, color, and odor.
Filters can be built on location with local materials. The exterior is made of concrete, with gravel and sand layered inside. Rain, surface, or ground water is poured through the top and filtered as it passes through the layers of sand and gravel. The sand filters 1 litre of water per minute, enough to provide an entire family with sufficient water for their daily drinking, cooking, cleaning, and hygiene needs. (www.manzwaterinfo.ca)
