The stirring speed reducer is installed on the top or bottom of the tank according to requirements. The stirring forms include mechanical stirring, magnetic stirring and air stirring system, and the stirring blades are of anchor type, propulsion type and spiral type. Quick-opening manhole, one-piece mirror lights, thermometer (number display and dial) level gauge interface (point capacitance, ultrasonic, differential and glass tube liquid level meter for choice), clean air to breathe interface interface (360- degree rotating the cleaners or binary automatic washer), import and export of material liquid, spare mouth, import and export,import and export of condensation water of steam.