Abstract: Using a continuous dissolving and feeding device equipped with two or more storage tanks for storing two or more kinds of powdery polymer coagulants individually feeders which are able to control feed rate, connected to the storage tanks, a mixing tank equipped with a feed water pump, and a filtering member, the powdery polymer coagulants stored in the storage tanks are fed to the mixing tank via the feeders; a dispersing solution is prepared by mixing the powdery polymer coagulants with water in the mixing tank; the dispersing solution is passed through the filtering member to prepare an aqueous coagulant solution; and the aqueous coagulant solution is added to sludge or waste water.

Abstract: This invention relates to a sanitary facility room to be installed in a computer room or a clean room found in a manufacturing factory for a semiconductor element wherein the water supplying means is operated by a control part received a sensed signal from the sensing means by a sensing operation of the sensing means for a human body, a cleaning water is supplied to the sanitary device to form water films at the inner surface of the sanitary device and to perform an automatic cleaning of the sanitary device.