Troubleshooting: What's the difference between OasisMist 1000S and LV600S? OasisMist 1000S owns 10 Liters capacity, lasts up to 100 hours, and features cool mist. LV600S owns 6 Liters capacity, lasts up to 50 hours, and features warm and cool mist. If you need a humidifier with a super-long duration and less refilling, that's it! Levoit OasisMist 1000S Smart Ultrasonic Cool Mist Tower Humidifier Note: Distilled/ purified water is preferred for your health.