Water Filters Home Page > Home > Consumer Information > Appliances > Water Filters >     Related categories: » Top/Science/Environment/Water Resources/Drinking Water/Filtration and Treatment » Top/Shopping/Home and Garden/Kitchen and Dining/Water Treatment   Web Sites HowStuffWorks: Charcoal Filters What is activated charcoal and why is it used in filters? http://www.howstuffworks.com/question209.htm   HowStuffWorks: Reverse Osmosis How does reverse osmosis work to purify or filter the water? http://www.howstuffworks.com/question29.htm     Water Filters

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