Spray Chrome

Deionized water must be there to remove any salts that are produced in the process. Is there heating in the process? This would/could convert the silver chloride to silver. Also the sodium nitrate that is produced could be washed away with water. And the excess sodium chloride is washed away. Regular tap water contains other ions that you probably don't want to have when applying the coating. There is my two cents. I am only going off the couple things stated and have no knowledge of the process.