You don’t need to know much about science to understand that when water meets metal, there’s a danger of corrosion starting. Corrosion is the term given to the chemical reaction between water and metal in the presence of oxygen. The damage from it causes the destruction of the metal.
There’s one appliance in your home that is particularly in danger of this chemical reaction—your tank water heater. This huge metal appliance stores and circulates water, and yet, it never rusts. How is that possible? Well actually, corrosion is very rare for water heaters, due in large part to your anode rod.