& nbsp; the company at the whitecaps Shiyan City Economic Development Zone, is mainly in the production and sale of filter industry and trade enterprises, in the course of business company adhere to the people-oriented, integrity management, innovation and development of the business philosophy, the excellent quality and customer trust as the primary goal of Dong Yi. Company after years of development, the advantage of technology, scientific management and perfect after-sales service system and dedication for our customers to provide quality service, and you join hands in creating a better tomorrow, the company adhering to the "integrity management, quality and refinement" business philosophy, for each customer to provide high quality products and the most professional service.