What is the white residue in my coffee pot or cooking vessels?
Water contains minerals that are left behind when the water is heated or evaporates. These minerals, as well as the drinking water, are safe. However, they can leave spots on glassware such as coffee pots and shower doors, which are commonly referred to as “hard water stains”. The spots can also be caused by the over use of some dish detergents. The spots should come off by washing and/or reducing the amount of dish detergent.