Abstract: A black algae spot treatment tool for attaching to a swimming pool pole for directly treating and eliminating black algae spots which typically build up on the plaster surfaces of a swimming pool. The tool includes a chlorine stick, a collet vise for clampedly slidably removably holding the chlorinating stick whereby a user may apply the chemical directly to a colony of black algae within the pool. The device also includes two holes laterally positioned opposite each other and located far enough up from the bottom of the tool for receiving a standard plastic "V" spring used throughout the art in the field for attaching tools to the end of pool poles whereby the user may treat black algae spots located below the water level without entering the pool.