Therapeutic substance dispensing shower head system

A shower head system for dispensing a therapeutic substance, the shower head system comprising:

• a shower head, the shower head having proximal and distal ends, a primary fluid passageway extending between the proximal and distal ends for conducting a flow of water from the distal end and outward from the proximal end, and an interior housing having a bore;
• a sleeve, the sleeving having opposite first and second ends, and a sleeve bore extending between the first and second ends thereof, the sleeve being disposed in the bore;
• a bushing, the second end of the sleeve disposed in a bore of the bushing, and the sleeve being rotatable relative to the bushing about a rotation axis ending between the proximal and distal ends;
• a cartridge socket, the cartridge socket having a socket opening through the proximal end, a socket end wall spaced from the socket opening in a direction toward the distal end, and a socket sidewall extending between the socket opening and the socket end wall, the socket sidewall being defined by a sidewall of the sleeve bore;
• a cartridge removably inserted into the cartridge socket and releasably retained therein, the cartridge having a dispensing end that is spaced from the socket end wall when fully inserted into the cartridge socket thereby providing a diffusion gap between the dispensing end and the socket end wall, the cartridge having a substance containing space;
• a diffusion passageway extending through the socket sidewall at a location between the socket end wall and the proximal end and fluidically connecting the diffusion gap and the primary fluid passageway;
• and
• wherein rotating the sleeve relative to the bushing selectively opens and closes the diffusion passageway.