Under what conditions would the pre-treatment capabilities of a reverse-osmosis freshwater generator MOST likely be overloaded, and as a result, these conditions should generally be avoided?

Correct Answer: Option B — Entering harbors.

Harbor waters contain high concentrations of suspended solids, silt, and organic contaminants that rapidly overwhelm pre-treatment filters. Operating in these conditions accelerates fouling, requiring frequent backwashing or element replacement. Marine machinery maintenance protocols dictate avoiding RO operation in turbid coastal waters to preserve membrane integrity and system performance.