Disclosed is a dispenser(10) for dispensing a wash chemical solution which h as been created by dissolving a solid wash chemical (65) in a diluent. The dispenser (10) has a sump (48) which is positioned beneath an outlet port (40) for the wash chemical solution, so that the sump (48) collects the dissolved wash chemica l. The sump (48) is contained within a reservoir (17), and overflow from the sump (48) is collected within the reservoir (17). A pick-u p tube (27) withdraws the wash chemical solution from the reservoir (17). The sump (48) is retained within the reservoir (17) by flexible tabs (72) and a support member (51) against which the sump (48) is positioned. A screen is provided above the sump (48) for filtering unwanted particulates.