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Quite simply put, Reverse Osmosis Water Filters are the most efficient way to remove the largest number of contaminants commonly found in water. Reverse osmosis is the single most effective way to remove most impurities from drinking water, but it works even better in combination with other methods. Most filtration systems, both residential and municipal, combine reverse osmosys filtration with a pre-filtering method to remove large particles suspended in the water that would gum up the filter and reduce its effectiveness. Dissolved particles are then removed by the RO membrane – which effectively can remove most minerals (including salts), metals and many organic impurities from drinking water. Finally, filtered water will be forced through a ‘polishing filter’, often activated carbon, which will remove the remaining contaminants, and most objectionable odors and tastes from the water.