Gas solution supply device

A gas solution supply device comprising:

• a first gas-liquid separator in which gas solution is stored;
• a second gas-liquid separator which is provided at a stage subsequent to the first gas-liquid separator and in which gas solution to be supplied to a use point is stored;
• an intermediate line provided between the first gas-liquid separator and the second gas-liquid separator;
• a pressure booster pump that is provided on the intermediate line and increases a pressure of gas solution being supplied from the first gas-liquid separator to the second gas-liquid separator;
• a gas supply line that supplies gas as a material of the gas solution;
• and
• a first gas dissolving unit that is provided on the intermediate line and dissolves the gas supplied from the gas supply line in the gas solution supplied from the first gas-liquid separator,
• wherein the first gas-liquid separator comprises a liquid supply line through which liquid as a material of the gas solution is supplied, the liquid supply line comprising a second gas dissolving unit that dissolves undissolved excess gas discharged from the second gas-liquid separator in the liquid as a material of the gas solution.