... filter material. 3. Gravel Filter Media for Water Purification Functions:1).with a high mechanical strength2).has stable chemical properties3 ... equipment Operational Address:East Of 2nd Floor, Unit 1, High Level, Mingyang Garden, Gongyi , Gongyi Henan, China (Mainland) ... Registered Address:East Of 2nd Floor, Unit 1, High Level, Mingyang Garden, Gongyi, Hnan, China (Mainland)Legal Representative ...