A dispenser system includes a dispenser having a housing and an actuator, a liquid container disposed in the housing, a pump operably connected to the dispenser, and an adjuster. The actuator is configured to be manually operated to manually activate the pump to discharge liquid from the liquid container. The actuator is formed with a front side and a rear side facing the rear of the dispenser. The adjuster is configured to selectively limit a displacement of the actuator to define a corresponding predetermined maximum dose volume when the liquid is being discharged from the liquid container. The adjuster is movable between at least a first position and a second position.