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Activated carbon is the most effective type of filter against chemicals and odors. The fiber of activated carbon filters physically bond with these contaminates. Activated carbon is the most powerful adsorbent known to science. It surpasses virtually any other means of removing odors and contaminants from air and water. Activated carbon filters chemical odors such as in photo labs, pet odors, moldy musty basement smells, animal barns, and household garbage.