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Slow sand filter - Wikipedia
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![PDF] Slow sand filtration as a water treatment method : An inventorying study of slow sand filters purification rates in rural areas in Colombia | Semantic Scholar](https://d3i71xaburhd42.cloudfront.net/13e96af79598b6b2a8ed08a3193858e7521a0863/22-Figure8-1.png "PDF] Slow sand filtration as a water treatment method : An inventorying study of slow sand filters purification rates in rural areas in Colombia | Semantic Scholar")