3M Purification looks at liquids and gases through rose-colored filters. The company, a unit of 3M's Industrial and Transportation segment, makes a full line of filtration products for the health care, fluid-processing, and potable-water markets. Its filters remove contaminants as small as molecules and particles as large as sand from liquids and gases. They are used to purify drugs, paints and resins, oil and gas, and home drinking water. 3M Purification caters to the life sciences, residential air and water filtration, industrial filtration, food beverage manufacturing, food service, and custom engineered products sectors.