Two-part fluid delivery systems

1. A foam dispenser system comprising:

a foamable liquid container;

an concentrate container;

an air source for providing pressurized air;

a mixing chamber;

one or more liquid conduits placing the contents of the foamable liquid container in fluid communication with the mixing chamber;

one or more air passages placing the air source in fluid communication with the mixing chamber;

an outlet conduit out of the mixing chamber;

one or more concentrate conduits placing the contents of the concentrate container in fluid communication with one of the liquid conduits, the air conduits, the mixing chamber and the outlet conduit;

mix media located within the outlet conduit; and

a vent for venting the concentrate.

2. The foam dispenser of claim 1 wherein the concentrate container comprises an oxidizer.

3. The foam dispenser of claim 1 wherein the one or more concentrate conduits place the concentrate in fluid communication upstream of at least a portion of the mix media.

4. The foam dispenser of claim 2 wherein the oxidizer is a liquid.

5. The foam dispenser of claim 2 wherein the oxidizer is a powder.

6. The foam dispenser of claim 2 wherein a foam output of the dispenser contains between about 2000 parts per million and about 16,000 parts per million of oxidizer.

7. The foam dispenser of claim 2 wherein a foam output of the dispenser contains between about 6,000 parts per million and about 10,000 parts per million of oxidizer.

8. The foam dispenser of claim 1 wherein the dispenser comprises a housing and a concentrate pump for pumping the concentrate and wherein the concentrate pump is affixed to the housing and the second container for holding the concentrate is removable from the housing for replacement when the concentrate container is empty.

9. The foam dispenser of claim 1 wherein the concentrate conduit is in fluid communications with the liquid conduit upstream of the mixing chamber.

10. The foam dispenser of claim 1 wherein the concentrate conduit is in fluid communications with the air conduit upstream of the mixing chamber.

11. The foam dispenser of claim 1 wherein the mix media comprises a plurality of baffles.

12. The foam dispenser of claim 1 further comprising a level sensor.

13. The foam dispenser of claim 12 wherein the level sensor includes a color sensor for detecting a color to determine whether the level is below a selected level.

14. The foam dispenser of claim 1 further comprising a safety interlock, wherein the safety interlock that prevents dispensing of concentrate if the level of foamable liquid is below a selected level.

15. The foam dispenser of claim 1 further comprising a safety interlock, wherein the safety interlock that prevents dispensing of foamable liquid if the level of concentrate is below a selected level.

16. A foam dispenser comprising:

an concentrate receptacle;

a vent for venting the concentrate;

an concentrate pump;

a foamable liquid receptacle;

a foamable liquid pump;

an air pump;

a mixing chamber;

an concentrate inlet;

a foam generator; and

an outlet;

wherein the concentrate pump pumps concentrate from the concentrate receptacle to the concentrate inlet;

wherein the foamable liquid pump pumps foamable liquid from the foamable liquid receptacle to the mixing chamber;

wherein the air pump pumps air into the mixing chamber;

wherein the concentrate, foamable liquid and air form a mixture that is forced through at least a portion of a foam generator and is dispensed through the outlet as a foam.

17. The foam dispenser of claim 16 wherein the foamable liquid receptacle and the foamable liquid pump form a refill unit is removable and replaceable.

18. The foam dispenser of claim 16 wherein the foamable liquid receptacle, the foamable liquid pump, the air pump, and the mixing chamber form a refill unit that is removable and replaceable.

19. A foam dispenser comprising:

an concentrate receptacle;

an concentrate pump;

a receptacle for receiving a refill unit that includes a foamable liquid container, a foamable liquid pump and a mixing chamber having an outlet;

a conduit configured to releasably engage with the outlet of the refill unit when the refill unit is installed in the foam dispenser;

an concentrate inlet in fluid communication with the conduit;

a foam generator located at least partially downstream of the concentrate inlet; and

an outlet;

a first sensor for sensing a parameter indicative of the level of concentrate;

a second sensor for sensing a parameter indicative of the level of foamable liquid; and

an interlock that prevents dispensing if one of the first sensor and second sensor indicate a low level.