The invention relates to a concentrated product storage cartridge for a diluting and dispensing container, comprising an external body, with an open lower end having a closing edge on the lower end thereof; and on the opposite end, there are flaps extending above the cylindrical tube of the external body, comprising a quick-coupling means; an opening for accessing the inner region thereof, where is placed an internal plunger, forming a filling region; and, on the upper end thereof, having quick-coupling means to be attached to the cover of cartridge. Said cover comprises upper ring flaps, arranged in order to interlock with the quick-coupling means of the internal plunger, forming a single assembly with an opening that can engage with the flaps of the external body, which are mounted in a way to provide displacement mobility in both directions downwards and upwards in relation to the internal plunger head.