What is often done during routine testing of backflow prevention devices?

Routine testing of backflow prevention devices primarily involves pressure testing as a crucial method to ensure the devices are functioning correctly and preventing the backflow of contaminants into the potable water system. During pressure testing, the device is subjected to various pressures to assess its effectiveness and reliability in maintaining a one-way flow of water. This type of testing helps identify any potential leaks, failures, or malfunctions in the device, ensuring that it meets safety and regulatory standards.

While visual inspection can be a part of the routine checks, it does not provide the comprehensive assessment that pressure testing offers. Piping modification is generally not a routine part of testing but rather an action taken when there is a definitive need for structural changes within the system. Flushing of the system, while beneficial for maintaining overall water quality, is not a standard procedure specifically associated with testing the backflow prevention devices themselves. Therefore, pressure testing is the essential practice for verifying device functionality and maintaining safe drinking water standards.