... speed:20-25m/h •IntroductionNutshell Filter Material is also named Walnut Shell Filter Material,it is selected the fine walnut shell as raw material,finished through ... ,Coalbased Activated Carbon,Coconut Shell Activated Carbon,Woodbased Activated Carbon,Anthracite Filter Media,Walnut Shell Filter,Manganese Sand Filter,Quartz Fiter Sand,Ceramic Filter Sand,Biological Particulate ...