History of Carbon Filters
Carbon filters have been used for several hundred years and are considered one of the oldest means of water purification. Historians have shown evidence that carbon filtration may have been used in ancient Egyptian cultures for both air and water sanitization. 2000 B.C. Sanskrit text refers to filtering water through charcoal (1905 translation of "Sushruta Samhita" by Francis Evelyn Place). The first modern use of a carbon filter to purify potable water occurred in 1862. Carbon filtration was further advanced in the mid-1970s by H. Allen Rice and Alvin E. Rice when they first manufactured a porous carbon block for drinking water use.
Currently, carbon filters are used in individual homes as point-of-use water filters, groundwater remediation and, occasionally, in municipal water treatment facilities. They are also used as pre-treatment devices for reverse osmosis systems and as specialized filters designed to remove chlorine-resistant cysts, such as giardia and cryptosporidium.
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