Abstract: A system for dissolving solid chemicals in an aqueous liquid, the system including a hopper that holds a plurality of stacked solid blocks containing water treatment chemicals for use in industrial and process applications, a liquid flow control system that delivers a selectively controlled flow of pressurized aqueous liquid to sprayer outlets that cause the pressurized liquid to impinge sequentially against the bottom surface of the bottom block in the stack, thereby successively dissolving each block, and a reservoir disposed beneath the stack that collects and holds the aqueous fluid containing the solubilized chemical from the blocks until it is discharged for subsequent use.