Porcelain ring is widely applied to freshwater; sea-culture, which plays an important in biochemistry filtering capacity. It adopts natural quartz sand, through heating, and is characteristic of stable chemical; large specific area and uneasily contamination, which provides for effective breeding environment. The products present network and high penetration structure as well as oxidation and anaerobic type dechlorination. Our products are sold well both at home and abroad, which is one of the best filtering product, we can design various kinds of high performance bricks; plates and pipe etc.