The activated carbon filter uses activated carbon as a filter medium to remove residual chlorine, organic substances, colloids, silicon, odors, and its surface active functional groups from water, catalytically oxidizing certain heavy metal ions. It is widely used in urban water supply decolorization and deodorization treatment systems, reclaimed water advanced treatment systems, domestic sewage recycling systems, industrial wastewater advanced treatment systems, industrial wastewater heavy metal treatment systems, and pre-treatment systems for reverse osmosis, ion exchange, electrodialysis, etc. It is an ideal treatment equipment for industrial purified water.