Water purification method

In a method of purifying water comprising a step of passing the water through a water purification filter, the improvement comprising the water purification filter comprising a filter element having a pore diameter of from 10 to 2,000 angstroms, a pore volume of from 0.1 to 1.1 cm3/g and comprising an RB ceramic or a CRB ceramic, wherein the RB ceramic is formed from a carbonaceous material obtained by mixing degreased bran derived from rice bran with a thermosetting resin to form a mixture, kneading the mixture, pressure-molding the kneaded mixture to form a molded mixture, drying the molded mixture and baking the dried mixture in an inert gas atmosphere at a temperature of 700 to 1,000° C. and the CRB ceramic is formed by mixing the RB ceramic carbonaceous material with a thermosetting resin to form a second mixture, kneading the second mixture, pressure-molding the kneaded second mixture at a pressure of 20 to 30 MPa to form a molded second mixture and heat-treating the molded second mixture in an inert gas atmosphere at a temperature of 500 to 1100° C.