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The appropriate frequency for performing bottom blow-off on a low-pressure boiler is daily. This process is crucial for maintaining boiler efficiency as it helps remove sediment, sludge, and other contaminants that can accumulate in the bottom of the boiler. Regular bottom blow-off prevents corrosion and scaling, which can adversely affect the boiler's operation and longevity. Daily maintenance of this nature ensures that the boiler remains in optimal working condition and adheres to safety standards and regulations.

Other frequencies listed may not effectively manage the buildup of sediments in a timely manner, leading to potential operational issues or safety hazards. Regular daily blow-off is a best practice in maintaining the health and efficiency of a low-pressure boiler system.