An ozonated liquid dispensing unit (10, 11), comprising: a liquid input port to receive water into the unit (10, 11) from a water supply; a first dielectric cell to produce ozone gas; the first dielectric cell comprising an output trap connected to an output end of the first dielectric cell; a second dielectric cell for producing ozone gas; the output trap of the first dielectric cell in communication with an input trap of the second dielectric cell for supplying the second dielectric cell with a supply gas comprising ozone gas generated from the first dielectric cell, and the second dielectric cell produces additional ozone gas from the supply gas; an injector in fluidic communication with the liquid input port; the injector in supply communication with the second dielectric cell for receiving the ozone gas from the first and second dielectric cells (220, 240), wherein the injector mixes the ozone gas from the first and second dielectric cells (220, 240) with the water from the liquid input port to produce an ozonated liquid; and, a reaction vessel, the reaction vessel comprising a housing, the housing defining an interior; a first end comprising an entry port for the ozonated liquid; a second end comprising an exit port for the ozonated liquid; a cone positioned in the interior of the housing between the entry port and the exit port; and a liquid output port to discharge the ozonated liquid from the unit (10, 11); wherein the cone comprises a first cone end and a second cone end, wherein the first cone end has a smaller external diameter than the second cone end, and wherein the entry port directs the ozonated fluid toward the first cone end. a liquid input port to receive water into the unit (10, 11) from a water supply; a first dielectric cell to produce ozone gas; the first dielectric cell comprising an output trap connected to an output end of the first dielectric cell; a second dielectric cell for producing ozone gas; the output trap of the first dielectric cell in communication with an input trap of the second dielectric cell for supplying the second dielectric cell with a supply gas comprising ozone gas generated from the first dielectric cell, and the second dielectric cell produces additional ozone gas from the supply gas; an injector in fluidic communication with the liquid input port; the injector in supply communication with the second dielectric cell for receiving the ozone gas from the first and second dielectric cells (220, 240), wherein the injector mixes the ozone gas from the first and second dielectric cells (220, 240) with the water from the liquid input port to produce an ozonated liquid; and, a reaction vessel, the reaction vessel comprising a housing, the housing defining an interior; a first end comprising an entry port for the ozonated liquid; a second end comprising an exit port for the ozonated liquid; a cone positioned in the interior of the housing between the entry port and the exit port; and a liquid output port to discharge the ozonated liquid from the unit (10, 11); wherein the cone comprises a first cone end and a second cone end, wherein the first cone end has a smaller external diameter than the second cone end, and wherein the entry port directs the ozonated fluid toward the first cone end.