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Water pollution, changes in the chemical and physical condition and biological characteristics of water, limiting its further use. In all types of water use changes or physical condition (such as heat) or chemical composition of the water — at entry of pollutants, which are divided into two main groups: the change over time in water and remain there unchanged. The first group includes the organic components of domestic sewage and industrial blshaya part, such as waste paper mills. The second group consists of many inorganic salts, such as sodium sulfate, which is used as a dye in textiles and inactive organic substances such as pesticides.