Replacement Water Chamber for DreamStation by Philips Respironics The DreamStation Replacement Water Chamber by Philips Respironics is compatible with all DreamStation CPAP and BiPAP machines. This water tub should be cleaned at least once a week with mild soap and water. It is also top rack dishwasher safe. NotePlease use distilled water to minimize limescale buildup in the water chamber. Replace your DreamStation CPAP Machines Water Chamber | Philips at RespShop. Genuine Philips Respironics water chamber for clean, efficient humidification.