The invention relates to a dispensing system (1) for delivering at least one cleaning-agent preparation (A, B, C) into the interior of an automatic dishwasher, encompassing a dispenser (2) having a light source (4), and a cartridge (3) couplable to the dispenser (2), in which cartridge at least one flowable preparation (A, B, C) is stocked; the cartridge (3) has a width (b) to depth (t) ratio from 3:1 to 20:1 and the cartridge (3) has a height (h) to depth (t) ratio from 3:1 to 20:1, and the walls of the cartridge (3) have, at least locally, a transmittance from 75% to 99% in the wavelength region between 700 nm and 1 mm; the flowable preparation (A, B, C) has a transmittance from 75% to 99% in the wavelength region between 700 nm and 1 mm.