Active carbon; protection coal granular active carbon; Acid washing carbon; new type nitrogen gas catalyzing deoxidizer; coal granular active carbon; highly active sorb coal granular active carbon; granular charcoal; retrieve solvent coal granular active carbon; ball-shaped activated carbon; coating; contact agent carrier coal granular active carbon; powdery carbon; steep; purified water coal granular active carbon; raw coal stave; Activated carbon filter material