Manufacturing apparatus and manufacturing method for ultra fine bubble containing liquid

A manufacturing apparatus for an ultra fine bubble containing liquid, the manufacturing apparatus comprising:

• an ultra fine bubble generating unit configured to generate ultra fine bubbles in a liquid;
• a circulation path for the liquid where the circulation path includes the ultra fine bubble generating unit;
• a circulating unit disposed in the circulation path on a downstream side of the ultra fine bubble generating unit and configured to circulate the liquid through the circulation path;
• a blocking unit disposed in the circulation path on an upstream side of the ultra fine bubble generating unit and configured to switch between closing and opening of the circulation path;
• and
• a control unit configured to control the ultra fine bubble generating unit, the circulating unit, and the blocking unit,
• wherein the control unit alternately executes a first mode in which, with the blocking unit open, the ultra fine bubble generating unit is driven while the circulating unit is being driven, and a second mode in which, with the blocking unit closed and the ultra fine bubble generating unit stopped, the circulating unit is driven.