De'Longhi humidifier emits a white dust on nearby surfaces.

Safety first: Unplug the humidifier before maintenance.

Step-by-step:

• 1. Switch to distilled water: Use distilled or demineralized water to greatly reduce mineral dust.
• 2. Install demineralization cartridge: If your De'Longhi model supports it, install or replace the demineralization cartridge in the tank.
• 3. Reduce output: Lower the mist output setting or move the unit farther from sensitive surfaces.
• 4. Clean room surfaces: Wipe affected surfaces with a damp cloth to remove existing dust.