PROBLEM TO BE SOLVED: To solve such the problem that a polyvinyl chloride pipe and a metal pipe used as an aqueduct or a vent pipe has no action of cleaning and activating a liquid phase and a vapor phase.SOLUTION: The inside of the polyvinyl chloride and metal pipe is coated with a coal layer having a thickness of 0.05 to 2 mm, and a liquid phase and a vapor phase moving at the inside of the pipe are made the similar state of moving at the inside of the layer of the coal and are cleaned and activated.【課題】導水管や通気管として使用する塩化ビニルパイプや金属パイプには、液相や気相を浄化活性する働きがなかった。【解決手段】塩化ビニルパイプや金属パイプの内側を０．０５ｍｍ～２ｍｍ厚みの炭層で覆ったものであり、パイプ内を移動する液相や気相は、炭の層の中を移動するのと同様となり浄化活性される。【選択図】図１
