Pure water in industries such as electronics, medicine and food, etc: purification and preparation for water used in textile industry and chemical industry: purification and preparation for water used in food and drinks and enological process concentration and recovery of the useful materials of aqueous solution in industrial production: preliminary desalination processing of high pressure boiler make-up water of the enterprises, Such as electrical power plant, etc: brackish water and seawater desalinization: as the first class desalinating equipment for high purity water production.