Patients frequently ask, "can I use tap water in my humidifier"? Buying distilled water is an additional expense and can be inconvenient. But here's why you might want to keep using distilled water.
Using tap water will cause discoloration of the water chamber and the minerals from tap water will be deposited in the chamber causing an ugly scale. This is of some concern but the mai reason to use distilled water is to maximize the life of you positive airway pressure machine. Manufacturers warn using tape water in the water chamber of you humidifier can decrease the life expectancy of your machine. Some insurance companies will only purchase a new machine every5-7 years.