A shower head configured to deliver a continuous dose of water dispersed treatment from a water disintegratable tablet form treatment source, the shower head including: a hollow shower head body having a restricted water inlet opening at one region and a water outlet at another region, the water outlet being defined by perforations in a perforated plate, to allow a water flow between the inlet and the outlet, and a perforate mesh formation defined by a matrix of rigid elements against which a disintegratable tablet form treatment source introduced in said mesh formation can abrade, said perforated mesh formation being disposed within the hollow shower head body between the water inlet opening and the perforated plate; wherein the restricted water inlet opening exits adjacent a rear wall of the hollow body, and the hollow body is inclined toward the perforated plate and shaped to direct at least a portion of the water flow from the restricted water inlet downwardly toward the perforated plate, characterized in that the restricted water inlet has a cross section that has a maximum length of 10-14 mm and a maximum width of 2-3 mm, wherein the shower head is configured such that said water disintegratable solid tablet form treatment source introduced into the hollow shower head body between the water inlet opening and the mesh formation prior to use is able to rotate and move within the water flow so as to be agitated by the water flow against the mesh formation and repeatedly abrade against the mesh formation to assist in disintegration of said water disintegratable tablet and thereby be dispersed into the water flow prior to the water exiting the hollow shower head body through the perforated plate. a hollow shower head body having a restricted water inlet opening at one region and a water outlet at another region, the water outlet being defined by perforations in a perforated plate, to allow a water flow between the inlet and the outlet, and a perforate mesh formation defined by a matrix of rigid elements against which a disintegratable tablet form treatment source introduced in said mesh formation can abrade, said perforated mesh formation being disposed within the hollow shower head body between the water inlet opening and the perforated plate; wherein the restricted water inlet opening exits adjacent a rear wall of the hollow body, and the hollow body is inclined toward the perforated plate and shaped to direct at least a portion of the water flow from the restricted water inlet downwardly toward the perforated plate, characterized in that the restricted water inlet has a cross section that has a maximum length of 10-14 mm and a maximum width of 2-3 mm, wherein the shower head is configured such that said water disintegratable solid tablet form treatment source introduced into the hollow shower head body between the water inlet opening and the mesh formation prior to use is able to rotate and move within the water flow so as to be agitated by the water flow against the mesh formation and repeatedly abrade against the mesh formation to assist in disintegration of said water disintegratable tablet and thereby be dispersed into the water flow prior to the water exiting the hollow shower head body through the perforated plate.