Which step ensures that the installation procedure has eliminated air pockets in the system?

Draining the faucets is the step that ensures that the installation procedure has eliminated air pockets in the system. When air pockets are present in a plumbing or water treatment system, they can cause various issues, such as impaired water flow or ineffective treatment. By draining the faucets after installation, any trapped air can be released, allowing a steady flow of water and ensuring that the system is filled with water rather than air. This is crucial for proper functioning and efficiency of the system.

The other steps do not specifically address the elimination of air pockets. Opening the bypass valve can allow water to flow through the system, but does not ensure that air pockets are specifically removed. Connecting the influent is a preparatory step that sets up the system for operation but does not tackle air displacement. Testing the control valve is important for verifying that the system operates correctly but similarly does not focus on addressing trapped air.