PROBLEM TO BE SOLVED: To provide a carbonated spring apparatus at a low price without the need of a construction, while young people wanting to install an artificial carbonated spring apparatus in a house are increasing.SOLUTION: In a method of using a container for storing a carbon dioxide gas in an upper part inside the container and hot water in a lower part, bringing the hot water sent to the container and the carbon dioxide gas into sufficient contact with each other inside the container and dissolving the carbon dioxide gas, a method and apparatus for supplying and stopping the carbon dioxide gas by opening and closing a mechanical valve by the movement of a float inside a float container separate from the container are proposed. Further, the method and apparatus for operating an auxiliary piston only when the mechanical valve is opened so as to open and close the mechanical valve by the slight movement of the float are proposed. Since the method does not require power supply, a price is suppressed to b
