The Cleanable Water Chamber for the AirSense™ 11/AirCurve™ 11 HumidAir™ Heated CPAP Humidifier by ResMed is dishwasher safe and should be cleaned once a week in the dishwasher by hand with warm water and mild detergent. Allow all parts to dry without direct sunlight or heat before reusing. Use only distilled water with this water chamber.