Abstract: A dry pellet dispensing device for installation on a well to chemically treat water drawn from the well. The device includes a pellet reservoir having two reversely inclined floor portions which direct the pellets toward a metering drum. The metering drum is mounted for rotation at an outlet end of the lower of the two floor portions. A plurality of pellet receiving indentations are spaced along the periphery of the metering drum. A drive motor rotates the drum which acts to capture a pellet in each of its pellet receiving indentations. Captured pellets are carried out of the pellet reservoir by the drum and released into a dispensing tube which directs them into the well. The drive motor is controlled by an adjustable interval timer that is responsive to the flow of water from the well.