A water filter is a life saver when safe drinking water is unavailable. The health consequences of drinking untreated water can be severe. Water filters are also a cheaper and more environmentally friendly option for obtaining clean water than bottled water. Take this quiz to learn more about water filters. 
Source: http://feeds.howstuffworks.com/~r/DailyStuff/~3/K7_IqWWygGo/water-filter-quiz.htm
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