Imerys Filtration Mineral Inc
U.S Silica Holdings Inc
Calgon Carbon Corporation,
Showa Chemical Industry Co. Ltd
Dicalite Management Group Inc.
Jilin Yuan Tong Mineral Co. Ltd.
Qingdao Best diatomite co.ltd.
Shenzhou Xinglong Products of Diatomite Co.Ltd
Caltron clays & chemicals pvt. Ltd
Nova Industries Ltd