Twice a week. According to Watson's official website, if you can't apply wet compress every day, it will lead to coarse pores, excessive skin cleaning and lack of water. Watsons distilled water has been producing distilled water for Hong Kong people since 1903, and it has been a subsidiary of Watsons Group since 198 1. Watson's distilled water adheres to its faith and strives for innovation repeatedly, and can enjoy 100% pure quality distilled water.