I have been using Yeoju stone pot in Korea. Previously used pottery was coated with a fine hole of pottery, and now it is a pot that is not coated. I do not know harmful ingredient and taste is good. However, it is not easy to handle because it is inconvenient and difficult to handle. Disadvantages: Be careful about burning because steam comes into the hole in a hot state. It is a bit heavy because it is earthenware and it is inconvenient to wash. Advantages: The harmful substances have less chance of affecting the human body and taste is good.
Japanese double lid stone pot 2 size Masataki Mei Jin