Disposable refill cartridge for a liquid soap dispensing system

A disposable refill cartridge for a liquid soap dispenser, said cartridge comprising:

• a closed container having a bottom wall portion and a rear wall portion and two opposed side wall portions, an outlet opening formed in a cylindrical neck extending from said bottom wall portion, a frustoconical portion intermediate said bottom wall portion and said cylindrical neck, at least one boss extending outwardly from said frustoconical portion and said cylindrical neck, two elongated recesses respectively formed in said side wall portions adjacent to said rear wall portion, each of said recesses extending downwardly to said bottom wall portion, said container having stepped retaining surfaces at the upper end of said rear wall portion and at the lower ends of said side wall portions, and a receptacle formed in the rear wall portion having an apertured end wall and a plastic filter within said receptacle.