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:*[https://www.raintree-foundation.org/assets/files/BioSand-Filter-Factsheet.pdf BiosandFilter] | :*[https://www.raintree-foundation.org/assets/files/BioSand-Filter-Factsheet.pdf BiosandFilter] | ||
:*[http://groups.google.com/group/open-design-water-purification-system Open Design Water Purification System] | :*[http://groups.google.com/group/open-design-water-purification-system Open Design Water Purification System] | ||
:*[http://www.theseptictankshop.co.uk/ wastewater] | |||
These sites provide technological or educational information: | These sites provide technological or educational information: |