Referring to the illustration, an oil-water separator is in the re-circulation mode due to high oil content of the processed water outlet. What action may be required before the unit is capable of discharging overboard once again? GS-0175

Correct Answer: Option A — Flushing the oil content detector with clean water.

If the oil content monitor detects levels above 15 ppm, it triggers a recirculation mode. The detector probe itself may become fouled by oil residue, causing false high readings. Flushing the detector with clean water is the standard procedure to clear the sensor and restore accurate monitoring for overboard discharge.