Humidifier produces a musty or moldy odor during operation.

Safety first: Unplug the unit before cleaning. Avoid inhaling dust or mold directly.

• Discard old water: Empty the tank and base completely.
• Replace the wick: Remove and discard the old wick filter. Install a new Essick Air wick.
• Sanitize the reservoir: Clean the tank and base with a mild bleach solution (1 teaspoon of unscented household bleach per gallon of water). Let sit for 20 minutes, then rinse thoroughly until no bleach smell remains.
• Dry components: Allow the unit to air dry fully before reassembly.
• Use fresh water: Refill with clean, cool water. Consider using Essick Air bacteriostatic treatment if recommended for your model.

Going forward, empty and refill the tank daily and clean the unit weekly to prevent odors.