Caustic lime is a term used to describe a white, alkaline substance which is produced by heating calcium carbonate in a kiln. It is widely used in several industries including construction, agriculture and chemical manufacturing. The word "caustic lime" is often used interchangeably with lime, quicklime, burnt lime, and calcined lime, which are all synonyms for this same substance. It is known for its caustic, corrosive properties, hence the name. Caustic lime is frequently used as a desiccant, a disinfectant, and as a pH regulator in industrial processes. It is also used in water treatment to reduce acidity and to improve the quality of drinking water.