Negative ORP
Hydrogen rich water is characterised by exhibiting a negative ORP. A high ORP value (in positive numbers), indicates that a substance has a higher oxidizing potential. In generalised terms, for humans a positive or high ORP is better for the outside of the body (cleaning and sanitizing). A low ORP value (in negative numbers) indicates that a substance has a higher antioxidizing potential, and is preferred for oral consumption. Just like pH, ORP values are an important measurement for determining the quality of water.