I have a CPAP machine with humidifier. It requires the use of distilled water. When I saw this'll device, I decided it would save time and money to purchase it. When I got it I was impressed with it's quality. Though I wish it was a bit faster in making a gallon of a gallon of water. It's quiet, so what I decide to do is to start it when I go to bed, then store the freshly made water in a separated container. One added use, is in my coffee maker, which needs to be decalcified occasionally...using distilled water . And the coffee tastes great.. I recommend this product.