Abstract: In a reviving apparatus for a fluid passage has a device for passing fluid through the fluid passage, at least one rotational flow making device for making rotational flow of the fluid, and at least one reviving material supplying device for supplying of reviving material so as to be carried by the fluid made rotational flow thereof, the rotational flow making device has a discharge pipe which is to be connected to one end of the fluid passage at outlet end thereof, a fluid chamber which surrounds the inlet end of the discharge pipe and has an inlet portion of the fluid, and a plurality of nozzles which are elongated from the fluid chamber into the dischage pipe through the wall of the discharge pipe so as to be inclined in the same rotational direction around the axis of the discharge pipe.