🔍 Key Concepts

• Potable water means water that is safe for drinking and food prep, so contamination risk must be minimized. • Standard sanitary practices for tanks that store drinking water on vessels. • The difference between disinfecting a tank and simply cleaning or painting it.

💭 Think About

• Think about which choice best protects crew and passengers from waterborne illness after an inspection and cleaning. • Ask yourself which chemicals or materials are normally approved for treating drinking water systems, and which would be unsafe or illegal. • Consider whether any step is required between ‘clean tank’ and ‘refill with potable water’ to ensure microbiological safety.

✅ Before You Answer

• Verify which option directly addresses disinfection for drinking water and not just cosmetic or structural maintenance. • Eliminate any choices that would clearly contaminate or chemically taint the water supply. • Confirm that the action you pick is consistent with public health standards for potable water systems, not just general tank maintenance.