Using Purified Water in CPAP Machines

Types of Water for CPAP Humidifiers

Sterile water is the gold standard for bubbling humidifiers in respiratory devices and is recommended for medical-grade respiratory equipment 2, 3
Distilled water is acceptable for CPAP humidifiers and is specifically mentioned in guidelines for heated humidification in sleep apnea treatment 1
Purified water can be used as an alternative to distilled water, though it may contain more minerals than distilled water which could lead to mineral buildup in the humidifier chamber over time 4

The American Academy of Sleep Medicine recommends using heated humidification with CPAP devices to reduce side effects such as dry mouth, nasal congestion, and sore throat 1
Guidelines indicate that sterile, distilled, or even tap water can be used to fill wick humidifiers in medical settings, but CPAP humidifiers typically use a different mechanism 3
Research has shown that inadequate humidification is a primary cause of dry mouth and other upper airway symptoms in PAP therapy 5

Using water with high mineral content can lead to mineral deposits in the humidifier chamber, potentially reducing the effectiveness of the device and requiring more frequent cleaning 4

Use only the type of water recommended by your specific CPAP manufacturer, which is typically distilled water 1, 4
Monitor for symptoms of respiratory irritation or infection, which may indicate contamination of the humidifier system 5

Using tap water in areas with hard water can lead to rapid mineral buildup in the humidifier chamber 4
Assuming that all water labeled as "purified" meets the same standards - purification methods vary and may leave different levels of minerals and potential contaminants 4