A cartridge (100, 200) for use with a liquid diffusing device, the cartridge (100, 200) comprising: a cartridge housing (110a, 110b, 210a, 210b) defining an internal housing cavity (113, 213) partially filled with a liquid to be diffused; a diffusion head (140, 240) positioned within the internal housing cavity (113, 213), the diffusion head (140, 240) including a venturi device (147, 247) for generating a diffused liquid from the liquid contained in the internal housing cavity (113, 213); and an insert positioned downstream of the diffusion head (140, 240), wherein an inlet (172, 272) is adapted to receive the diffused liquid generated by the venturi device (147, 247), wherein the insert (170, 270) comprises: a body (171, 271) formed as a single, unitary piece which includes: the inlet (172, 272) provided in the body to receive diffused liquid generated within the cartridge (100, 200) during operation of the liquid diffusing device; an outlet zone (114, 214) defined at least in part by the body through which to discharge the diffused liquid toward an external environment; and a tortuous passage (176, 276) extending between the inlet (172, 272) and the outlet zone (114, 214) to aid in further reducing an average particle size of the diffused liquid as the diffused liquid moves through the tortuous passage (176, 276), wherein the tortuous passage (176, 276) is at least partially defined by a vertical sidewall of the body (171, 271), wherein the inlet (172, 272) is located at a periphery of the body (171, 271), the outlet zone (114, 214) is located at a central region of the body, and the tortuous passage (176, 276) spirals between the inlet (172, 272) and the outlet zone (114, 214). a cartridge housing (110a, 110b, 210a, 210b) defining an internal housing cavity (113, 213) partially filled with a liquid to be diffused; a diffusion head (140, 240) positioned within the internal housing cavity (113, 213), the diffusion head (140, 240) including a venturi device (147, 247) for generating a diffused liquid from the liquid contained in the internal housing cavity (113, 213); and an insert positioned downstream of the diffusion head (140, 240), wherein an inlet (172, 272) is adapted to receive the diffused liquid generated by the venturi device (147, 247), wherein the insert (170, 270) comprises: a body (171, 271) formed as a single, unitary piece which includes: the inlet (172, 272) provided in the body to receive diffused liquid generated within the cartridge (100, 200) during operation of the liquid diffusing device; an outlet zone (114, 214) defined at least in part by the body through which to discharge the diffused liquid toward an external environment; and a tortuous passage (176, 276) extending between the inlet (172, 272) and the outlet zone (114, 214) to aid in further reducing an average particle size of the diffused liquid as the diffused liquid moves through the tortuous passage (176, 276), wherein the tortuous passage (176, 276) is at least partially defined by a vertical sidewall of the body (171, 271), wherein the inlet (172, 272) is located at a periphery of the body (171, 271), the outlet zone (114, 214) is located at a central region of the body, and the tortuous passage (176, 276) spirals between the inlet (172, 272) and the outlet zone (114, 214). the inlet (172, 272) provided in the body to receive diffused liquid generated within the cartridge (100, 200) during operation of the liquid diffusing device; an outlet zone (114, 214) defined at least in part by the body through which to discharge the diffused liquid toward an external environment; and a tortuous passage (176, 276) extending between the inlet (172, 272) and the outlet zone (114, 214) to aid in further reducing an average particle size of the diffused liquid as the diffused liquid moves through the tortuous passage (176, 276), wherein the tortuous passage (176, 276) is at least partially defined by a vertical sidewall of the body (171, 271), wherein the inlet (172, 272) is located at a periphery of the body (171, 271), the outlet zone (114, 214) is located at a central region of the body, and the tortuous passage (176, 276) spirals between the inlet (172, 272) and the outlet zone (114, 214).