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How should you clean your already clean-ish tap water?

By and large, American tap water is pretty clean and safe. However, most domestic water supplies contain small amounts of lead and other chemicals, plus bacteria and other unwanted guests. So, how to get rid of it? According to CNET, there are two basic ways of going about it. The cheapest solution is to add this extra filtration is a pitcher filter. But for the ultimate in clean water, you want a reverse osmosis system.
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