Club soda

Club soda is a form of carbonated water manufactured in North America, commonly used as a drink mixer. Sodium bicarbonate, potassium sulfate, potassium bicarbonate, potassium citrate, or sodium citrate is added to artificially replicate constituents commonly found in natural mineral waters and offset the acidity of introducing carbon dioxide gas (which creates low 3–4 pH carbonic acid when dissolved in water).

Naturally effervescent Selters water from Germany gave rise to the generic use of the term for carbonated water, particularly from a soda siphon, in the United States as seltzer water. Seltzer water is artificially carbonated but lacks added minerals.