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See also:

• Science: Environment: Water Resources: Drinking Water: Filtration and Treatment  (53)
• Shopping: Home and Garden: Kitchen and Dining: Water Treatment  (100)

• Home Water Treatment Using Activated Carbon - Discussion and guidelines from a 1997 article from the Michigan State University Extension.
• HowStuffWorks: Charcoal Filters - What is activated charcoal and why is it used in filters?
• HowStuffWorks: Reverse Osmosis - How does reverse osmosis work to purify or filter the water?
• Treatment Systems for Household Water Supplies - Activated Carbon Filtration - 1992 article from the North Dakota State University Extension Service explaining in detail what activated charcoal systems can and cannot do.