Can I use smart water for CPAP?
Can I use smart water for CPAP? However, the answer is the same - Smart water has additives. Either these additives remain behind in a hard water stain or they evaporate with the potential to irritate your sinuses. Either way, you have unwanted consequences. Your CPAP instructions probably say to use distilled water only - for good reason.
What happens if your CPAP runs out of water?
Your device will function normally and safely without water in the tub, but it will no longer provide humidification.