What is the primary function of a pellet dropper in water treatment?

The primary function of a pellet dropper in water treatment is fundamentally tied to the process of adding certain treatment chemicals, such as chlorine tablets or other solid disinfectants, directly into the water system. When considering the choices provided, the option indicating wells aligns with this function because wells can be a point of entry or source of water where treatment is necessary. A pellet dropper can be utilized in conjunction with wells to ensure that proper amounts of disinfectants are dispensed as water is drawn from the ground source, enhancing water quality and safety.

This method of treatment is crucial during the initial stages of processing water for distribution, where it is essential to ensure adequate disinfection while maintaining consistent quality standards. In contrast, the other options—day tanks, elevated storage tanks, and ground level storage tanks—focus more on the storage and management of water, rather than directly applying treatment chemicals during the purification process. These containers are important for maintaining supply and providing adequate pressure in the system, but they do not directly involve the functionality of a pellet dropper.