The pH value of the water indicates the density of hydrogen ions. The substances that give hydrogen ions to aqueous solutions are called "basic substances". The pH value in the water is measured in numbers from 1 to 14.
pH 7 equals the hydrogen and hydroxyl ion level, that is, the water is neutral. If the Hydrogen Ions increase, the pH value of the water decreases and the water becomes acidic. Conversely, as hydrogen ions decrease, the pH value increases and the water becomes alkaline. According to Turkish standards, the pH value in drinking water should be between 4.5 and 9.5.
Low-pH waters are corrosive and are water that should not be drunk because they can dissolve a number of metals with these properties. High pH waters are especially recommended for people with stomach ailments and dieters. Since all metabolic processes in the body depend on a balanced pH, consumption of water that is "basic", ie, greater than pH 7, is useful for health.