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Compatible with Honeywell HC-888 Filter C; Compatible with Honeywell humidifier models: HCM-890, HCM-890B, HCM-890C, HCM-890-20, HCM-890-MTG, HEV-320B, HEV-320W. Improves efficiency of the humidifier, eliminates minerals and impurities from the water, providing clean, fresh moisture. Replace filter every 4-6 weeks, depending on usage and hardness of water.