Slow sand filters have been proven to almost entirely remove the disease-causing organisms found in water. These organisms - known as pathogens - include bacteria, viruses, protozoa, cysts, helminths, and worms. The Biosand technological adaptation of slow sand filtration has proven as effective as traditional slow sand filters, in both laboratory and field tests. The technology has been introduced in more than 30 countries, by a diversity of organizations and people employing a diversity of means.
In conjunction with the introduction of the technology to communities, the filter has been tested by various government, research, and health institutions, as well as by non-governmental agencies.
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