Patent ID: 7246793

Claim:
A carbonic water production method which comprises circulating water in a water tank through a carbonic acid dissolving apparatus by a circulation pump, and feeding a carbonic acid gas into the carbonic acid gas dissolving apparatus to dissolve the carbonic acid gas in the water, said method including: an early step of applying a necessary pressure of a carbonic acid gas in order to produce a carbonic water having a desired concentration of carbonic acid gas, in the early circulation of the water for producing carbonic water, and a concentration maintaining step of applying a necessary pressure of the carbonic acid gas and circulating the carbonic water in order to maintain the desired concentration of carbonic acid gas of the carbonic water produced at the early step, wherein the necessary pressure of carbonic acid gas in the early step is 0.15 MPa to 0.3 MPa, and the necessary pressure of carbonic acid gas in the concentration maintaining step is 0.001 MPa to 0.1 MPa.