▎ 摘　　要

NOVELTY - A graphene or its derivative, preferably graphene oxide and graphite oxide is integrated as a flat component with a water-permeable filter medium in a cylindrical hollow component. USE - Graphene or its derivative, preferably graphene oxide and graphite oxide is used for forming filter system used in drinking water treatment in domestic area and industrial area, and wastewater treatment. ADVANTAGE - The graphene or its derivative enables economical and space-saving formation of filter system having improved filtration performance, with low installation cost and labor cost. DESCRIPTION OF DRAWING(S) - The drawings show a schematic view explaining the attachment of graphene or its derivative to the carrier layer. Carrier layers (1,2,3)