S. Korea to produce 'ultrapure water' equipment for … stocking 0 41 2021.10.28 14:38 https://youtu.be/ydTzwQjYSfM + 25 반도체 필수 자재 '초순수'…국산화 나선다 One essential material needed for making semiconductors is ultrapure water. South Korea has been relying on other ...