LEVOIT Superior 6000S Smart Evaporative Humidifiers for Home Whole House up to 3
𝙂𝙚𝙣𝙪𝙞𝙣𝙚 𝙋𝙧𝙚𝙢𝙞𝙪𝙢 𝙒𝙞𝙘𝙠 𝙁𝙞𝙡𝙩𝙚𝙧: Residue or discoloration is due to removal of impurities from water. Levoit lab tests show no impact on air quality or humidification efficiency due to discoloration.