System for producing micro bubbles in a liquid comprising: - a suction fitting attached to a bathtub, which draws a liquid mixture of micro bubble and water from said bathtub for recycling, and fluidly connected via interconnecting plumbing to the bathtub, - a high-pressure circulation pump, in fluid communication with the suction fitting, discharging pressurized liquid from the suction fitting into an injector, the injector, through a differential of inlet and outlet pressure, creates a vacuum that draws a gas into the pressurized liquid stream, - a saturation and mix tank, in fluid communication with an outlet of the injector, adapted to agitate and saturate the liquid with the gas, and comprising a pressure vessel containing at least one inlet port and one outlet port, - the outlet port of the saturation and mix tank adapted to distributes, under pressure, the homogenized liquid and gas mixture to a single or a plurality of micro bubble jet attached through an opening to a shell of the bathtub, and - a micro bubble generating apparatus (300, 1300, 2300, 3300, 4300), which receives the pressurized liquid and gas mixture from the saturation and mix tank, comprises a housing body configured to mechanically receive and engages on an orifice nozzle, the liquid and gas mixture is distributed through an opening in the orifice nozzle into a series of pathways in the housing body oriented at an angle to each other, characterized in that, at the outlet of the orifice nozzle, the housing body of the micro bubble generating apparatus (300, 1300, 2300, 3300, 4300) includes an intermediate chamber with sidewalls tapering inwardly in a direction from bottom to top towards the fluid flow, wherein the homogenized liquid and gas mixture, from the outlet port of the saturation and mix tank, is, in use, delivered to a micro bubble hand shower through a diverter valve, wherein the micro bubble generating apparatus (300, 1300, 2300, 3300, or 4300) is provided upstream of the micro bubble jet and between the saturation and mix tank and the diverted valve, the series of pathways comprising two first fluid pathways (312, 316) directly connected to the intermediate chamber and oriented perpendicular to the top portion of such intermediate chamber, the series of pathways further comprising two second fluid pathways (314a, 314b) directly connected to and oriented perpendicular to the first fluid pathways (316, 312) respectively, or only a single second pathway directly connected to and oriented perpendicular to the first fluid pathways (316, 312). - a suction fitting attached to a bathtub, which draws a liquid mixture of micro bubble and water from said bathtub for recycling, and fluidly connected via interconnecting plumbing to the bathtub, - a high-pressure circulation pump, in fluid communication with the suction fitting, discharging pressurized liquid from the suction fitting into an injector, the injector, through a differential of inlet and outlet pressure, creates a vacuum that draws a gas into the pressurized liquid stream, - a saturation and mix tank, in fluid communication with an outlet of the injector, adapted to agitate and saturate the liquid with the gas, and comprising a pressure vessel containing at least one inlet port and one outlet port, - the outlet port of the saturation and mix tank adapted to distributes, under pressure, the homogenized liquid and gas mixture to a single or a plurality of micro bubble jet attached through an opening to a shell of the bathtub, and - a micro bubble generating apparatus (300, 1300, 2300, 3300, 4300), which receives the pressurized liquid and gas mixture from the saturation and mix tank, comprises a housing body configured to mechanically receive and engages on an orifice nozzle, the liquid and gas mixture is distributed through an opening in the orifice nozzle into a series of pathways in the housing body oriented at an angle to each other,