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Honeywell PC-1 ProTec™ Continuous Cleaning Cartridge - 1 Pack provides continuous protection against mineral buildup in humidifier. Simply drop the cartridge in the tank. Works in most humidifiers. Note: The Protec™ Cleaning Cartridge is antimicrobially treated to help prevent growth and migration of mold, fungus, algae, and other odor-causing bacteria in the cartridge only. Protec does not protect users or others from bacteria, viruses, germs or other disease organisms.