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Use distilled water instead and remove the demineralization cartridge. • For very hard water areas use only distilled water and remove the demineralization cartridge. • Use reverse-osmosis water (R-O water) instead of distilled water and remove the demineralization cartridge. Cleaning light is on • Switch off the unit and unplug it. Empty the water in the base. Rinse the base with hot/clean water. Do not submerge the base! Visually inspect the base for dirt or mineral build up. If soft water is