A portable vegetation treatment system includes a primary pump, a secondary pump, an intake-port assembly, a distribution assembly, and a control assembly. The primary pump is configured to couple with a diluent source while the secondary pump is configured to couple with a reservoir, containing a chemically-based fluid. The chemically-based fluid may be a concentrate, pre-mixed concentrate or other fluid(s), requiring dilution or combination with another fluid before application. The secondary pump includes components that meter one or more chemically-based fluids, during active operation. These components also substantially restrict migration or inappropriate flow of the chemically-based fluid when the system is inactive or in a passive state.
