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Q&A How do slow sand filters work and are there any alternatives?

Slight Introduction: A slow sand filter is a filter used to purify water. The original design is composed of a layer of gravel, then a layer of fine sand. Sometimes, however, there is an extra...

1 answer  ·  posted 7y ago by Frank‭  ·  last activity 7y ago by System‭

Question water-purification