Ultrapure water (UPW) is water that has been purified to very strict specifications, containing by definition only H20, and H+ and OH– ions in equilibrium. Therefore, ultrapure water conductivity is about 0,055 uS/cm at 25oC, also expressed as resistivity of 18,2 MOhm.
Water molecules
Ultra pure water is mainly used in the semiconductor and pharmaceutical industry.
Ultrapure water production often is produced through processes like membrane filtration or ion exchange to reach the ultimate conductivity of 10 uS/cm.
