Abstract: A chemical dispenser for dispensing chemicals into a tank holding liquid, such as a swimming pool. The chemical dispenser has a housing, a lid, an inlet and an outlet. The lid is selectively attachable to the housing to permit a sanitizing chemical to be placed in the housing.In a method according to the present invention, a chemical dispenser having a housing, a lid selectively attachable to the housing, an inlet orifice and outlet orifice is provided, and the inlet orifice is positioned to receive circulated liquid from the circulating system outlet. Next, chemical to be dispensed into the circulated liquid is provided and placed in the housing. Then the lid is attached to the housing, and the outlet orifice is positioned such that the flow of liquid from the outlet orifice establishes a flow pattern in the tank which causes debris to travel to and be collected at a debris collection site of the tank.