Which term describes impurity sources such as leaks, foreign materials, and corrosion products entering a system?

• A. Ion Exchangers
• B. Impurity
• C. Impurity sources
• D. Water quality equilibrium

Answer: (C)

Impurities entering a system come from specific origins, and the term used to describe those origins is impurity sources. This focuses on where contamination is coming from, rather than the contaminants themselves or the methods used to remove them. Leaks, foreign materials, and corrosion products are examples of impurity sources because they act as the entry points that introduce contaminants into the system.

Seeing it this way helps distinguish between the contaminants (impurities) and their sources. Ion exchangers are devices that remove impurities, and water quality equilibrium describes the balance of dissolved species—neither term names the origin of contamination.