pH is the measurement of how basic or acidic something is. pH actually stands for Potential Hydrogen and is a measurement of the activity of the hydrogen ion. Typical pH range is 0-14 but actual pH levels can exceed these theoretical limits. pH adjustment is the alteration of pH or Potential Hydrogen by adding a pH reagent such as using an acid to drive pH downward or using a caustic or other alkaline substance to drive pH upward. Sulfuric acid and sodium hydroxide (caustic) are most commonly used. Caution must be used for pH adjust applications as an exothermic reaction will occur generating heat. The more severe the application the more heat generated. For example; pH adjusting tap water will create very little heat and is a non-issue. Neutralizing solutions with a high percentage acidic or bases can generate significant heat and therefore must be considered in design and materials.