... Sand with lower cost. It is the best filter material for industrial oiled water treatment such as oil field ... environmental chemical industry. •Company OverviewFounded in 1997,Gongyi Filter Material Industry Co.,Ltd. is one of the professional ... Carbon,Anthracite Filter Media,Walnut Shell Filter,Manganese Sand Filter,Quartz Fiter Sand,Ceramic Filter Sand,Biological Particulate Filters. For more details ...