Which pump is used to inject additives into the water stream?

• A. Booster Pump
• B. Circulation Pump
• C. Transfer Pump
• D. Additive Pump

Answer: (D)

Injecting additives into the water stream requires a pump designed for metered injection. This pump is built to introduce a precise amount of chemical into the moving water without disrupting system flow or pressure, ensuring accurate dosing as the water passes through the line. It typically draws from a chemical reservoir and injects into the main discharge (or suction) line, often with calibration and backflow prevention to maintain control and safety.

Booster pumps raise system pressure, circulation pumps move water within the system, and transfer pumps move liquid from one vessel to another. None of these are intended for injecting chemicals into the flow with controlled dosing, which is why the pump used specifically for additives is the correct choice.