Industrial water plays a very important role in the whole national industrial system. At present, China's industrial water accounts for about 80% of urban water resources. Among them, the consumption of cooling water in industrial water ranks first, generally more than 60%. Industrial water saving is an important link to protect water resources. Water saving should first start with industrial water, and cooling water has become the primary goal. The main way to save cooling water is to adopt circulating cooling mode and improve concentration multiple. Industrial cooling water is generally divided into two types: once through cooling water and circulating cooling water. Once through cooling water directly discharges the water used for cooling to rivers and lakes, which is disposable and causes a waste of resources. Circulating cooling water is used to cool the used water again after cooling through the cooling tower. The whole water system is in a dynamic process of continuous circulation and belongs to multiple use. The circulating water cooling system is divided into closed type and open type. The cooling water of the open circulating water cooling system is cooled through the cooling tower. During the recycling process, the cooling water will contact with the air, the water volume will change, and the content of various minerals and ions in the water will continue to increase. It is necessary to make up water for the system and discharge a certain amount of concentrated water. The closed circulating cooling water system adopts closed cooling equipment. The water flows in the pipe and is not directly exposed to the air. The heat of the return water is taken away by other heat exchange media to achieve the effect of cooling. The circulating water cooling system needs to solve the problems of agglomeration, corrosion and microorganism of pipelines and equipment.