Which action is performed to verify testing procedures in a water treatment system?

The process of initiating a manual regeneration cycle in a water treatment system serves as a crucial step in verifying testing procedures. This action allows technicians to assess the functional efficiency and performance of the system by simulating conditions that the system undergoes during normal operation. During regeneration, you can observe how the system responds, and whether it meets expected performance metrics like iron removal, hardness reduction, or removal of other contaminants.

This step can also help ensure that the various components, such as the control valve and brine tank, are functioning correctly. By running the manual regeneration cycle, it's possible to verify whether the settings on the system's controller align with expected results, making it an essential part of the verification process.

While other options may be relevant to system maintenance or assessment, they do not directly verify the testing procedures in the same comprehensive manner that a manual regeneration cycle does. For instance, draining the system completely may disrupt normal operations and not provide relevant data about performance, inspecting for system leaks is necessary for maintenance but does not check operational performance, and analyzing influent water quality is part of overall monitoring but doesn't verify the system's functionality directly during a particular phase of operation.