🔍 Key Concepts

• MARPOL Annex IV deals with sewage, while gray water is generally considered separately from sewage under many vessel pollution plans. • Think about the difference between sewage (black water) and gray water on board ships. • Gray water often comes from everyday washing and cleaning activities, not from toilets or industrial/cargo operations.

💭 Think About

• Which of these choices most clearly matches water from normal domestic washing activities, like in a galley or accommodation spaces? • Which items in the list are more closely connected to sewage or medical waste, rather than simple wash water? • If you were writing a pollution management plan, which of these drains would you be most concerned about mixing with sewage rather than gray water?

✅ Before You Answer

• Confirm which sources are generally classified as sewage/black water under MARPOL (especially anything involving toilets or human waste). • Identify which option is clearly tied to domestic washing/cleaning rather than medical, cargo, or toilet systems. • Make sure the drain source you pick would produce water similar to that from sinks, showers, and galley operations.