Copper plate’s ‘d orbital’ free electrons which are in high energy state will remove Virus, Bacteria and plastic nano particles from your water/filtered water when you store the water in a pot or a steel vessel and keep the plate in it overnight. This water is best for cooking and drinking too.Clean the plate every day with a little Tamarind + salt or Lime + salt. It is very easy to clean compared to a copper vessel. 4 X 12 inches :