And I was told never to use anything but 'distilled' water in my steam iron. Actually it was on the informational booklet in the box of the Proctor Silex iron I purchased in 1967. I'm still using that iron, it still works. It has never gunked up on me in nearly 50 years and I love the heft of it. Of course they will tell you to use tap water, you get to buy a new iron every couple of years. Oh, it doesn't look good, but then it has pressed thousands of seam, hems, etc and helped in many crafts. Paint is pretty much worn off on the handle. And the cord is electrical tape for a couple of feet but I love it. I may take it to the grave with me. LOL