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An essential condition for backflow preventers according to industry standards is that they must be checked annually. This requirement ensures that the devices are functioning properly to protect the potable water supply from contamination. Regular inspections help identify any potential failures or maintenance needs that could compromise the effectiveness of the backflow preventer. Through these annual checks, plumbing professionals can confirm that the mechanisms are operational and meet safety standards, thereby safeguarding public health.

The other options suggest practices that do not align with recommended guidelines for maintaining backflow prevention systems. For instance, asserting that they only need to be installed once overlooks the importance of ongoing maintenance. Relying on inspections "on demand" fails to provide a consistent safety standard, and ignoring the device after initial setup could lead to severe public health risks due to unnoticed malfunctions. Therefore, the annual inspection requirement is a crucial practice in backflow prevention to ensure safety and compliance with industry standards.