Humidifier leaves white dust on nearby furniture and surfaces.

Safety: Unplug before handling the tank or filters.

• Change water source: Use distilled or demineralized water to greatly reduce mineral dust.
• Install/replace cartridge: If your Philips model supports it, install a new demineralization cartridge or filter designed for the unit.
• Clean surfaces: Wipe affected surfaces with a damp cloth to remove existing dust.

This is not a hardware failure but a water quality issue. Using softer water is the long-term solution.