A dry pellet chlorinator is a device that mounts on the well and drops a compressed chlorine tablet down the well shaft into the well water. It is wired into the pump's electrical circuit and runs whenever the pump is pumping water, metering chlorine in proportion to water usage. An adjustment mechanism accounts for variations in pump sizes and water quality. As the pellet sinks to the bottom of the well and dissolves in the water, it releases chlorine that reacts with contaminants in the well. The chlorine OXIDIZES iron and manganese ions, preventing staining and allowing more efficient filtration, and SANITIZES contaminants like hydrogen sulfur, iron bacteria, algae, etc. preventing further growth.