The replacement Luna H60 Water Chamber for the Integrated H60 Heated Humidifier used with the Luna CPAP Machine should be replaced every six to twelve months to keep your CPAP equipment working like new. The water chamber holds 350 mL of water and should be cleaned regularly to ensure optimal humidification for extra comfort with your CPAP therapy. The replacement Luna H60 Water Chamber is the same chamber included with the Luna Integrated H60 Heated Humidifier at the time of purchase. This product only includes the replacement chamber for the heated H60 humidifier. Introducing humidification to your continuous positive airway pressure, especially if you have a respiratory condition or suffer from nasal congestion, can supply your sleep apnea therapy with excellent comfort to help you better adjust to sleep therapy. General Tips Section How do I Fill the Water Chamber? Lift the lid of your integrated humidifier to withdraw the chamber from the device. Please Note: The heater plate, located on the bottom of the chamber, will be hot after recent use. After turning the machine and humidifier OFF, please allow at least 15 minutes to pass before removing the chamber. Then, complete the following steps: DO NOT fill the hole on the top of the chamber with water. Turn to view the underside of the water chamber to locate the small dial on the front left side of the chamber. With the bottom facing upward, grip and turn the water inlet cap in a counterclockwise direction until the arrow on the cap is facing the triangular mark by the opening. Release any residual water still sitting in the chamber to ensure all of the water is fresh. Add approximately 350mL of water into the water inlet. DO NOT exceed the maximum water level. Place the water inlet cap over the opening and turn it in a clockwise direction to lock the cap in place. The arrow on the cap will be locked once it is directly across from the circular symbol. L4510