Seltzer

Seltzer, or seltzer water, is water that has been carbonated by dissolving carbon dioxide gas under pressure. It is typically unflavored and contains no minerals or additives, though some brands may add minerals or natural flavors. It is distinct from club soda, which contains added minerals, and from sparkling mineral water, which comes from a natural mineral spring and may also be carbonated.

The name derives from Selters, a spa town in Germany famous for its naturally carbonated waters. In the United States, seltzer has traditionally referred to plain, nonmineral carbonated water, while sparkling water can refer to either naturally carbonated mineral water or artificially carbonated water with minerals. The terminology varies by region and brand.

Production generally involves infusing purified water with carbon dioxide under pressure. Carbonation levels are often expressed in volumes of CO2, with typical seltzer around 2 to 3 volumes. Flavored variants exist, but plain seltzer contains no sugar, calories, or added flavors, making it a popular mixer and standalone beverage.

Uses and history: Seltzer has long been used as a refreshing beverage and as a versatile mixer in cocktails. Industrial production expanded in the 19th and 20th centuries, contributing to its widespread availability in many markets. Consumers may choose seltzer for hydration without sugar or for culinary and beverage applications.

Health and environment: Plain seltzer provides hydration with zero calories and no sugar. It is mildly acidic due to dissolved carbon dioxide and can cause gas in some individuals. Environmental considerations include the energy and water use involved in bottling and the sourcing of CO2, but seltzer itself is often seen as a low-sugar alternative to sodas when used without added flavorings.