🔍 Key Concepts

• Boiler water treatment aims to control scale, corrosion, and carryover by adjusting water chemistry. • Chloride in boiler water is a dissolved salt that is not destroyed by chemicals; it must be removed or diluted. • Blowdown is the intentional removal of boiler water to control the concentration of dissolved solids.

💭 Think About

• Think about whether chloride is something you can neutralize with a chemical, or if you need to physically remove water that contains it. • Which of the listed chemicals are typically used to control dissolved oxygen or pH rather than salt content? • What routine operator action is used to control total dissolved solids (TDS) in a boiler, including chlorides?

✅ Before You Answer

• Identify which option describes a mechanical/operational process rather than adding another chemical. • Recall what hydrazine is commonly used for in boilers (hint: dissolved oxygen control). • Consider whether any additive can actually remove chloride ions from the water, or if they just change other aspects of water chemistry.