Tap water is required to be safe as well as delicious, and sodium hypochlorite, which is used as a water disinfectant, is also required to have low impurities.
Shin-Etsu Aqua SSS is a grade for low-sodium chloride, low-chloric acid and low-bromic acid water chemicals that meet this demand, and has received Japan Water Supply Association (JWWA) water chemistry certification. In addition, there is a Shin Etsu Sodium hypochlorite first grade and a Shin Etsu Sodium hypochlorite Low salt grade.