Which of the following is NOT a primary use of water in ARFF operations?

In ARFF operations, water serves multiple critical functions, including cooling overheated equipment, extinguishing fuel spills and fuel fires, and controlling the spread of fire. Each of these uses directly supports fire suppression efforts and enhances the overall safety of operations.

Testing foam effectiveness, however, is not considered a primary use of water in ARFF operations. While water may be used during such testing, it is not a primary strategy or action taken in response to a fire incident. Instead, ARFF personnel focus on how well the foam performs under various conditions, and this testing is typically a controlled procedure separate from active firefighting efforts. The focus in actual operations remains on using water for immediate fire suppression and safety measures rather than as part of an evaluation process for foam agents.