Pump dispenser and cartridge

A cartridge for use in conjunction with a container to dispense a liquid in the cartridge into the container. The cartridge is comprised of a hollow body defined by an enclosing wall that has a closure at an upper end and a lower cartridge wall that is integral to the hollow body, but of a thickness less than that of the hollow body enclosing wall. The lower cartridge wall of a reduced thickness is in a narrowed section of the hollow body. A closure is sealed onto an upper part of the hollow body and has a funnel-like shape with a lower funnel wall. The funnel wall is of a reduced thickness as compared to the remainder of the closure. A flange on the hollow body rests on a container upper surface to support the cartridge on the container. A container closure will hold the cartridge in place during use. A dispensing pump on the container closure has a dip tube which pierces the funnel wall and cartridge wall and thereby dispense the cartridge contents into the container. The cartridge usually remains held onto the container until the contents of the container are depleted. The container will contain a diluent liquid for diluting the cartridge contents to the use concentration.