Filtration: Granular Bed Water Filters
Water filtration has existed for thousands of years. Egyptian Sanskrit writings dating to 2,000 B.C. describe early water purification as boiling water in copper vessels, exposing water to sunlight, and filtering through charcoal. Pictures of wick siphons are in the Egyptian tombs of pharaohs Amenhotep II (1,420 B.C.) and Rameses II (1,223 B.C.)...
by John L. Schlafer
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