Ultra-pure water is water produced by the American scientific and technological community for the development of ultra-pure materials (such as semiconductor component materials, nano-fine ceramic materials, etc.) by applying distillation, deionization, reverse osmosis technology or other appropriate supercritical fine technologies. This water contains almost no impurities except water molecules (H2O), let alone organic substances such as viruses and chlorinated dioxins. Of course, it does not contain the trace elements of minerals that the human body needs. Generally, it should not be drunk directly as it is harmful to the body and will release many ions from the human body.