... absorption ability 1)About Filter Media-Activated Carbon: We provide quality Coal and Coconut shell activated carbon. NSF certified types are available. Lower ... . For water filtation. All kinds of Water Filter Media:activated carbon, Coal,Coconutshell, NSF certified;Mineral Balls and Maifan Stones; ... and SS Membrane Housing, etc.YUNDA FILTER has been in this field for 11 years. We focus on this field ...