Upgraded Layer effectively filters impurities in hard water, extending the life and effect of the humidifier. Cleaning and replacement of the humidifier filter is recommended every 4-6 weeks for optimal performance. Improves efficiency of the humidifier by trapping mineral deposits from the water. High-quality material ensures stable humidification function by fully moistening the wicking humidifier filter before use. Regular maintenance ensures the normal use of your machine and prolongs its lifespan.