HOW SAND FILTERS WORK : FILTERS WORK

How sand filters work : Uhf notch filter.

How Sand Filters Work


how sand filters work
    sand filters
  • A filter used in water purification and consisting of layers of sand arranged with coarseness of texture increasing downward
  • (Sand filter) Sand filters are used for water purification. There are three main types; # rapid (gravity) sand filters # upflow sand filters # slow sand filters
  • (Sand Filter) Uses sand to collect debris from water running through it.
  • (Sand Filter) A filtration system that removes contaminants by forcing the water through a vessel of sand.  These require backwashing about once a month and have no need for replacement chemicals.
    work
  • exert oneself by doing mental or physical work for a purpose or out of necessity; "I will work hard to improve my grades"; "she worked hard for better living conditions for the poor"
  • a product produced or accomplished through the effort or activity or agency of a person or thing; "it is not regarded as one of his more memorable works"; "the symphony was hailed as an ingenious work"; "he was indebted to the pioneering work of John Dewey"; "the work of an active imagination";
  • A place or premises for industrial activity, typically manufacturing
  • Activity involving mental or physical effort done in order to achieve a purpose or result
  • Such activity as a means of earning income; employment
  • activity directed toward making or doing something; "she checked several points needing further work"

Filter Workshop
Filter Workshop
I was fortunate enough today to go for a tour of the Calgary offices of the Centre for Affordable Water and Sanitation Technology (CAWST). CAWST is an organization working to bring clean water to areas of the developing world that have poor water quality. One of their main programs uses a bio-sand filter that was developed by one of their members. This simple filter removes many pathogens and inorganic contaminants, and is easy to construct from local materials. The photos in this series are from their filter workshop. I admire the work that CAWST does as their model is to teach a community how to build and sell these filters locally rather than just dropping off technology without being sensitive to the local culture. My awesome friend Andrea works in Central and South America for CAWST, which is how I got the tour. These filters are setup for training sessions for people going into the field to diagnose potential problems.
Filter Workshop
Filter Workshop
I was fortunate enough today to go for a tour of the Calgary offices of the Centre for Affordable Water and Sanitation Technology (CAWST). CAWST is an organization working to bring clean water to areas of the developing world that have poor water quality. One of their main programs uses a bio-sand filter that was developed by one of their members. This simple filter removes many pathogens and inorganic contaminants, and is easy to construct from local materials. The photos in this series are from their filter workshop. I admire the work that CAWST does as their model is to teach a community how to build and sell these filters locally rather than just dropping off technology without being sensitive to the local culture. My awesome friend Andrea works in Central and South America for CAWST, which is how I got the tour. These are filter molds.

how sand filters work
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