🔍 Key Concepts

• Potable water treatment methods commonly used on ships • Difference between disinfectants and corrosive acids • Typical chemicals used to kill bacteria and pathogens in drinking water

💭 Think About

• Ask yourself which option is widely known as a disinfectant for drinking water, swimming pools, and municipal water supplies. • Consider which substances listed would be too corrosive or toxic to be safely added to water that people will drink. • Think about which chemical is commonly associated with controlling microorganisms rather than cleaning pipes or removing scale.

✅ Before You Answer

• Verify which choice is recognized in standard potable water treatment practices as safe at controlled doses. • Eliminate any substances that are primarily strong acids used for cleaning, descaling, or industrial processes, not for routine drinking water treatment. • Confirm that the remaining option is used specifically for disinfection (killing bacteria/viruses) and not for corrosion control or as a paint/metal treatment.