Variable flow concentration product dispenser

A dispenser having a vented liquid reservoir, the dispenser comprising an elongated channel having a dispensing nozzle at an exit end and an input for an input fluid at an input end , the liquid reservoir having at least two exit channels with an end aperture associated with an end of each exit channel, a transverse intersecting channel housing intermediate the input end and the exit end of the elongated channel, the transverse intersecting channel extending through the elongated channel, the transverse intersecting channel containing a movable insert with a plurality of input fluid apertures, the transverse intersecting channel communicating with at least one exit channel end aperture for connection to at least one exit channel, the at least one exit channel end aperture and at least one of the plurality of apertures of the movable insert being alignable, a venturi in at least one of the elongated channel, the transverse intersecting channel and the movable insert to cause a reduced pressure at the at least one aligned exit channel end aperture by the flow of input fluid through at least one of the plurality of apertures of the movable insert whereby a liquid in the liquid reservoir is drawn up an exit channel and through an exit channel end aperture into the moveable insert in the transverse intersecting channel and into the input fluid caused by the flow of the input fluid, the exit channel not then associated with the moveable insert then venting the liquid reservoir at the transverse intersecting channel to the exterior of the dispenser by passing a gas into the exit channel not then associated with the moveable insert, and into the liquid reservoir.