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Give it purpose - fill it with water filters, air filters, refrigerator filters, and more.
The Unifilter 81 is the compatible replacement for the following humidifier:
The Unifilter 81 Humidifier Filter Replacement is an evaporator pad that removes minerals from the water that evaporates. Replace your humidifier filter every 2 months or more in hard water areas, for optimum performance. Minerals that are left over on the evaporator sleeve will not blow into the airstream to collect in your living area.