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ASA (active aluminum sulfate) is used for water purification. The substance can be used as a reagent with high coagulating capability and activity in the treatment of natural, drinking, virtually all industrial and agricultural wastewater, which contains impurities (opacifiers, cutting emulsions, dyes, etc.) in the coarse, colloidal, truly dissolved states. It is a mixed type coagulant, which is derived based on aluminum sulfate salt with the addition of aluminum hydroxychloride. The advantage of ASA compared with Al2(SO4)3 is that it exerts coagulating properties both in warm and cold water, and is not expensive. It reduces color and permanganate oxidation indicators. With its use, the alkalinity and pH of water are virtually unchanged.
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