Humidifier shows 'CL' or a cleaning icon and beeps periodically

Safety: Unplug the humidifier and empty the tank before cleaning.

• Descale base: For Stadler Form ultrasonic and evaporative humidifiers (e.g., Eva, Oskar), fill the base water chamber with a mixture of white vinegar and water (1:1) and let it soak for 30–60 minutes. Do not immerse the entire unit.
• Clean tank: Wash the water tank with mild dish soap and a soft brush. Rinse thoroughly to remove any soap residue.
• Rinse components: After descaling, rinse the base with clean water several times to remove vinegar and loosened scale.
• Reset cleaning indicator: Follow the manual to reset the cleaning reminder (usually by holding the cleaning or timer button for several seconds).