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The lowest level of filtration, and the least expensive, is the carbon filter. This is the sort of water filtration system that screws onto your faucet, clearing water by forcing it through layers of activated charcoal. Impurities stick to the carbon, remaining behind while clean water goes through. These filters need to be changed fairly often, as they lose effectiveness fairly quickly. whirlpool refrigerator water filters Ceramic filters are similar, but use a layer of silicon diatomaceous earth instead of carbon. Reverse osmosis filters are the last common drinking water purifier, and filter out impurities through a passive filter system that is extraordinarily effective, even filtering salt out of ocean water.
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