Abstract: A cylindrical piston pump with an inlet suction line and outlet discharge port. The pump is capable of lifting chlorine-containing fluid from out a portable container and, with little inducement save gravity, automatically transferring the liquid to a desired, generally lower location. The automatic transfer is effected by flap or analogous valve control; while semi-automatic is effected by rotary or shuttle, manually actuated valves. Outflow is enhanced by gravity, spring return of the piston and/or connection of the discharge line to a fluid entrainment assembly.