If most of my cooking equipment is copper and my utensils are silver, I will not want to use a sanitizer that contain CHLORINE. This is because, chlorine in the sanitizer will react with the silver of the utensils to form a black layer of silver chloride on the utensils. Also, chlorine will react with the copper of the cooking equipment to form a cloud of copper ll chloride which will dissolve when it comes in contact with water forming a blue green solution.