Thank you for contacting us regarding the water panel (filter) for your 600A. Because there is a special coating on the water panel that helps the water adhere to the water panel, we don't recommend cleaning the water panel. By cleaning it, you may remove some of this coating and this will affect the performance of the water panel as well as the humidifier. We recommend changing the water panel with a genuine Aprilaire water panel for maximum performance. By replacing the water panel in the beginning of the heating season, your humidifier will be ready to run at peak performance for the winter.

If you have any further questions regarding this or any of our products, please feel free to contact our customer service department at your earliest convenience.