Method and apparatus for sanitizing water dispensed from a water dispenser having a reservoir

1. A water dispenser, comprising:

a) a housing having a reservoir surrounded by a reservoir wall and having a top, multiple inlets, a spigot for dispensing water;

b) a flow line in the housing for supplying water to the spigot;

c) the flow line communicating with a reservoir of water to be treated with ozone;

d) a pump positioned within the reservoir, the pump having a housing that includes a tubular part extending downwardly from the top of the reservoir, a motor mounted at the top of the tubular part of the pump housing and outside the reservoir, an impeller, and a hollow shaft connecting the motor to the impeller;

e) an ozone generator;

f) supply tubing connecting the ozone generator to the upper end of the hollow shaft, the hollow shaft being configured and arranged to deliver ozone gas to the center of the impeller;

g) a water inlet facing the bottom of the reservoir for introducing water to the pump housing interior;

h) wherein water and ozone mix within the pump interior;

i) the pump housing having a lower portion with an outlet for discharging a water and ozone bubble mixture into the reservoir in a spiral flow pattern about a central vertical axis of the reservoir.

2. The water dispenser of claim 1 wherein in the impeller is shaped to break up the ozone gas stream.

3. The water dispenser of claim 1 wherein the pump impeller has multiple vanes.

4. The water dispenser of claim 1 wherein the outlet has spiral rifling.

5. A drinking water dispenser, comprising;

a) a housing having a reservoir for containing water to be dispensed, the reservoir having a water surface and being surrounded by a reservoir wall that includes a side wall, a bottom wall, and a spigot for dispensing water from the reservoir;

b) a water supply that replenishes water to the reservoir that is withdrawn from the reservoir via the spigot;

c) an ozone supply for supplying ozone to the reservoir;

d) a flow line that extends between the reservoir and spigot, the flow line having a dispensed water intake near the bottom wall portion for supplying water from the reservoir to the spigot;

e) a pump positioned within the reservoir, the pump having a pump housing with a pump interior, multiple inlets, a discharge outlet and an impeller;

f) the inlets including an ozone inlet for introducing ozone to the pump housing interior;

g) the inlets including a water inlet for introducing water to the pump housing interior;

h) wherein water and ozone mix within the pump interior responsive to a rotation of the impeller; and

i) the pump housing having an outlet for discharging a water and ozone bubble mixture into the reservoir at a position near the bottom wall and in a direction substantially parallel to the bottom wall so that discharged ozone in the form of ozone bubbles can scrub the bottom wall and rise upwardly substantially the full depth of the reservoir.

6. The water dispenser of claim 5 wherein the pump has an electric motor drive.

7. The water dispenser of claim 6 wherein the motor driven pump has a pump housing with one or more fluid inlets and an impeller is placed inside the reservoir and the pump impeller breaks up the ozone gas stream.

8. The water dispenser of claim 5 wherein the pump has a discharge outlet with a structure that spirals ozone exiting the pump via the outlet.

9. The water dispenser of claim 5 wherein water and ozone enter the housing via separate inlets and mix inside the pump housing.