This system includes the Vent, 6" Cap and Wiring Kit, plus (4) - 2.2 lb containers of B&B's highly concentrated dry chlorine pellets. Designed for residential use Uses EPA- registered, 3/8" dry chlorine pellets. Holds approximately 5 lbs Adjusts automatically to water usage. Provides easy filling, monitoring and maintenance. Eliminates the need for mixing messy liquid solutions. Installs to compact, finished height of approximately 14"-18" above the well cap. 240V System