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HowStuffWorks: Charcoal Filters  - http://www.howstuffworks.com/question209.htm  What is activated charcoal and why is it used in filters?  Treatment Systems for Household Water Supplies - Activated Carbon Filtration  - http://www.ext.nodak.edu/extpubs/h2oqual/watsys/ae1029w.htm  1992 article from the North Dakota State University Extension Service explaining in detail what activated charcoal systems can and cannot do.  Home Water Treatment Using Activated Carbon  - http://www.msue.msu.edu/msue/imp/modwq/wq239201.html  Discussion and guidelines from a 1997 article from the Michigan State University Extension.  HowStuffWorks: Reverse Osmosis  - http://www.howstuffworks.com/question29.htm  How does reverse osmosis work to purify or filter the water?