A sprayer system comprising a tank containing a liquid having an upper liquid level, said tank having a lower wall with an opening formed therein and an interior chamber, a container positioned within the interior chamber of the tank, a lower portion of the container being attached by a fluid tight seal about the opening formed in the lower wall of the tank and a pump assembly attached to a lower part of the container, said pump assembly comprising a piston chamber having an outer surface and an inner surface and a piston reciprocally movable back and forth within the piston chamber, said piston being connected to a crank by a double pivot connection in which the crank is pivotally attached to an extension and the extension is pivotally attached to the center of piston, said crank being also connected to a pump handle such that up and down movement of the pump handle causes alternating back and forth movement of the crank which in turn causes said reciprocal back and forth movement of the piston via the double pivot connection, the piston comprising an inner wall, an outer wall and a collection chamber between the inner wall and the outer wall, characterized in that said system further comprises: a siphon comprising a tube within the tank that extends upwardly from the lower wall and has a top end opening positioned above the upper liquid level; a flexing seal member comprising a sealing bellows or accordion having an upper end, a bottom end and a mid-portion which comprises a plurality of flutes, lobes or waves that flex back and forth between a long configuration and a short configuration in accordance with back and forth movement of the piston within the cylindrical piston chamber; a first attachment attaching the bottom end such that it is compressed against the outer wall of the piston and a second attachment attaching upper end such that it is compressed against the wall of the cylinder thereby preventing any abrasive matter from entering the cylinder; wherein, upward movement of the pump handle causes the piston to move forth, resulting in lowered pressure in the piston chamber thereby causing liquid to move from tank through entrance conduits (91, 89) and into the piston chamber and, thereafter, downward movement of the pump handle causes the piston to move back, resulting in increased pressure in the piston chamber thereby forcing liquid out of the piston chamber through the exit conduit, through the siphon, out of the top end opening of the syphon located above the upper liquid level while a second disc blocks entrance conduit such that no liquid flows into the tank from the piston chamber; wherein any liquid that leaks between the piston and the inner surface of the piston cylinder is received within the collection chamber; and wherein the collection chamber is connected to the syphon; and wherein flexing of the seal member creates pressure changes within the collection chamber thereby expelling liquid that collects within the collection chamber though the syphon. a siphon comprising a tube within the tank that extends upwardly from the lower wall and has a top end opening positioned above the upper liquid level; a flexing seal member comprising a sealing bellows or accordion having an upper end, a bottom end and a mid-portion which comprises a plurality of flutes, lobes or waves that flex back and forth between a long configuration and a short configuration in accordance with back and forth movement of the piston within the cylindrical piston chamber; a first attachment attaching the bottom end such that it is compressed against the outer wall of the piston and a second attachment attaching upper end such that it is compressed against the wall of the cylinder thereby preventing any abrasive matter from entering the cylinder; wherein, upward movement of the pump handle causes the piston to move forth, resulting in lowered pressure in the piston chamber thereby causing liquid to move from tank through entrance conduits (91, 89) and into the piston chamber and, thereafter, downward movement of the pump handle causes the piston to move back, resulting in increased pressure in the piston chamber thereby forcing liquid out of the piston chamber through the exit conduit, through the siphon, out of the top end opening of the syphon located above the upper liquid level while a second disc blocks entrance conduit such that no liquid flows into the tank from the piston chamber; wherein any liquid that leaks between the piston and the inner surface of the piston cylinder is received within the collection chamber; and wherein the collection chamber is connected to the syphon; and wherein flexing of the seal member creates pressure changes within the collection chamber thereby expelling liquid that collects within the collection chamber though the syphon.