No matter how good your Humidifier is, you will still need to replace the wick. A dirty or clogged wick can lead to decreased airflow and possibly high moisture output causing dry air. The three most important things to note when replacing your humidifier wick are where you live, how much hard water you have in your tap water, and how often you use your Humidifier regularly. Changing the wick every 1 – 2 months or when it looks dirty is the ideal time to replace it. It is best to keep your Humidifier in a dry place, so if you have to remove the unit from its case for easy cleaning, don't worry.