The Hydro Systems BT420 Chem-Tainer Booster Tank is a two-pump model with a 24-gallon capacity. This system is a safe and reliable water reservoir and pump solution used to provide sufficient water flow and pressure to operate flush manifolds, solid dissolver systems, or any other dispensing system where low water flow and/or low water pressure are a concern. The reservoir automatically fills until it reaches 4 gallons and then will automatically shut off. The diaphragm pump will provide consistent, steady water flow and water pressure to dispenser systems.