What is a common sign that backflow prevention devices need maintenance?

Visible leaks or corrosion on the device is a clear indication that backflow prevention devices require maintenance. These signs point to the physical integrity and functionality of the device, which is crucial for preventing contaminated water from flowing back into the potable water supply. Any visible leaks suggest that the device is not properly sealing, which can compromise its effectiveness, whereas corrosion may indicate deterioration that could lead to failure in the system.

While other options may point toward issues that warrant attention, they do not directly signal the immediate need for maintenance of the backflow prevention device. For example, a decrease in water pressure alone might be the result of various factors unrelated to the backflow device, and increased taste of chlorine could stem from water treatment fluctuations rather than device malfunction. Regular use of non-potable water may indicate proper usage but does not specifically highlight the condition of the backflow device itself.