All right. According to the query science network. Boiling water in cast iron pot can improve water quality and remove 86% chlorine from tap water, so it is good to boil water in cast iron pot. Cast iron pot, also known as iron bottle, is a vessel for frying tea and boiling water. The teapot is made of pig iron, adopting traditional casting technology and hand-polished in the later stage, which has both health care, ornamental and collection value.