Regarding the high-pressure pump of a reverse-osmosis freshwater generator, what statement is true?

Correct Answer: Option C — The high-pressure pump is typically a multiple-cylinder reciprocating pump, but may be a multi-stage centrifugal pump.

High-pressure pumps in reverse osmosis units must overcome significant osmotic pressure. Multi-cylinder reciprocating pumps are commonly used for their ability to provide high, constant pressure with high efficiency, while multi-stage centrifugal pumps are utilized in larger systems to achieve the necessary discharge pressures required for effective membrane separation.