Humidifier Water Chambers should be replaced between 6-12 months. They use distilled water. If distilled water is unavailable then bottled water will be an effective alternative. The Water Chambers hold between 200-400ml of water.
Each Water Chamber is specific to the the CPAP or BiPAP machine that it fits. The Water Chamber should be cleaned daily with one part vinegar to three parts water. Many Water Chambers are dishwasher safe today, please check with the manufacturer information.
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