Removable cartridge for liquid diffusion device

A removable cartridge for use with a liquid diffusion device, the removable cartridge comprising:

• a cartridge housing defining an internal housing cavity partially filled with a liquid to be diffused;
• a diffusion head positioned within the internal housing cavity, the diffusion head including a venturi device for generating diffused liquid from the liquid contained in the internal housing cavity, and the diffusion head defining at least a portion of a gas supply conduit that extends from a bottom end of the removable cartridge to the venturi device through the liquid to be diffused to enable the venturi device to be supplied with pressurized gas from an external source via the bottom end of the removable cartridge;
• and
• an insert positioned above of the diffusion head, the insert including an inlet to receive diffused liquid generated by the venturi device, an outlet zone from which to discharge the diffused liquid toward an external environment, and a tortuous passage extending between the inlet and the outlet zone, and
• wherein an upper portion of the diffusion head and a lower portion of the insert define a primary expansion chamber immediately above the venturi device which is in fluid communication with the internal housing cavity external of the diffusion head via a plurality of apertures provided in the upper portion of the diffusion head.