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Water is essential to practically all industrial operations, but it cannot always be used just as it is drawn from stream, lake, or well. The impurities in raw water can seriously affect both equipment and product if appropriate precautions are not taken. Cooling is by far the largest industrial use of water, and for this purpose its quality can generally be quite poor. Corrosion, erosion, and slime growths comprise the major problems where untreated water is used for cooling. Water quality becomes an important consideration where water comes in contact with products; sometimes only traces of certain substances will affect products adversely.