What is the frequency for testing antifreeze solutions in sprinkler systems according to NFPA 25?

The correct answer, which is annually, reflects the regulations set forth in NFPA 25 regarding the maintenance and testing of antifreeze solutions in sprinkler systems. Antifreeze solutions are critical for ensuring that fire protection systems function correctly during cold weather conditions. The annual testing requirement ensures that the antifreeze concentration remains at an effective level to prevent freezing, thus maintaining the operational integrity of the sprinkler system.

Testing annually allows for proper assessment of the antifreeze's effectiveness and the overall condition of the system, ensuring that any issues can be identified and addressed before they lead to system failures. By regularly evaluating the antifreeze solution, property owners can ensure compliance with fire safety regulations and provide reliable protection against fire hazards.