Method and apparatus for sanitizing a drain

1. A method of sanitizing a drain having a drain conduit with a drain trap therein comprising the steps of:

(a) temporarily blocking said drain conduit at a position downstream of said drain trap;

(b) at least partially back-filling said drain upstream of said position with a sanitizing fluid; and

(c) during step (b), venting air from said drain conduit upstream of said position to a location of said drain conduit downstream of said position.

2. The method of claim 1 wherein said drain conduit is temporarily blocked in step (a) by inflating an inflatable device in said drain conduit at said position.

3. The method of claim 2 wherein said inflatable device is an inflatable bladder or an inflatable balloon.

4. The method of claim 2 further comprising the step, following step (b), of (d) unblocking said drain conduit at said position by deflating said inflatable device.

5. The method of claim 2 wherein said inflatable device extends into said drain conduit through an insertion conduit extending from said drain conduit.

6. The method of claim 1 wherein said air is vented in step (c) through a venting line extending from a location of said drain conduit upstream of said position to said location of said drain conduit downstream of said position.

7. The method of claim 6 wherein said venting line is positioned such that said venting line is flooded with said sanitizing fluid in step (b) after substantially all of said air is vented in step (c) from said drain conduit upstream of said position.

8. The method of claim 1 wherein said trap is a P-trap.

9. A method of sanitizing a drain having a drain conduit with a drain trap therein comprising the steps of:

(a) inflating an inflatable device in said drain conduit downstream of said drain trap;

(b) at least partially back-filling said drain upstream of said inflatable device with a sanitizing fluid; and

(c) deflating said inflatable device;

wherein said method further comprises the step, during step (b) of venting air from said drain conduit upstream of said inflatable device to a location of said drain conduit downstream of said inflatable device.

10. The method of claim 9 wherein said inflatable device is an inflatable bladder or an inflatable balloon.

11. The method of claim 9 further comprising the step, prior to step (a), of inserting said inflatable device into said drain conduit.

12. The method of claim 11 wherein:

said drain conduit and said drain trap are located beneath a floor and

said inflatable device is inserted into said drain conduit in said step of inserting through a conduit extending from said floor to said drain conduit.

13. The method of claim 11 further comprising the step of (d) removing said inflatable device from said drain conduit.

14. The method of claim 9 wherein said air is vented in said step of venting through a venting line extending from a location of said drain conduit upstream of said inflatable device to said location of said drain conduit downstream of said inflatable device.

15. The method of claim 14 wherein said venting line is positioned such that said venting line is flooded with said sanitizing fluid in step (b) after substantially all of said air is vented in said step of venting from said drain conduit upstream of said inflatable device.

16. The method of claim 9 wherein said trap is a P-trap.

17. In a floor drain having a drainage receiving structure installable in a floor, a drain conduit extending from said drainage receiving structure for installation beneath said floor, and a drain trap in said drain conduit, the improvement comprising an insertion conduit extending upwardly from said drain conduit downstream of said drain trap for inserting a blocking device into said drain conduit for temporarily blocking said drain conduit downstream of said drain trap, said insertion conduit having an upper end installable in said floor and the improvement further comprising a venting line for venting air around said blocking device, said venting line having a vent inlet end connected to said drain conduit upstream of said insertion conduit and a vent outlet end connected to said drain conduit downstream of said insertion conduit.

18. The floor drain of claim 17 wherein the improvement further comprises a flange on said upper end of said insertion conduit for installation in said floor.