April 2004
Volume 46 Number 4
 

Filtration: Granular Bed Water Filters
by John L. Schlafer   Pages: 

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.[1] Pictures of wick siphons are in the Egyptian tombs of pharaohs Amenhotep II (1,420 B.C.) and Rameses II (1,223 B.C.)...


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