An ink tank cartridge for an ink-jet type recording apparatus includes a housing with a plurality of walls forming a cavity and a bottom wall. A removable divider wall or spacer is inserted into the cavity which divides the cavity into first and second chambers. The spacer includes a wall section and a pair of legs extending from the wall which are spaced apart and are parallel to each other. The spacer is substantially U-shaped where the U-shape is formed by the legs and the wall section. A porous member is inserted into one of the chambers and resiliently abuts an opening of the supply port. The other chamber is at least partially filled with ink. The spacer has an opening to allow the ink to pass from the ink chamber to the foam chamber. The spacer is inserted into the chamber so that the opening is adjacent the bottom wall of the housing.