The answer to 'backflow preventer maintenance' is that backflow preventers should be inspected and tested annually by a certified plumber. Backflow preventers are critical safety devices that prevent contaminated water from flowing back into the clean water supply. Proper maintenance is essential to ensure they are working correctly.
During the annual inspection, the plumber will check for any physical damage, leaks, or issues with the internal components. They will also perform a test to verify the backflow preventer is functioning as intended. If any problems are found, the device may need to be repaired or replaced.