Difference Between Club Soda and Seltzer
Seltzer is just carbonated water with no additives. Club soda is carbonated water with added minerals (sodium bicarbonate, potassium sulfate) for a slightly salty, mineral taste. Both are zero-calorie and interchangeable in most drinks. Sparkling mineral water contains natural minerals; tonic water has quinine and sugar.
Key Takeaways
- Seltzer water is the simplest: plain water with carbon dioxide added for bubbles.
- Flavored seltzers are still zero-calorie; flavored 'sparkling water' varies by brand.
- Sodium content in club soda is small but may matter for very low-sodium diets.
Explanation
Seltzer water is the simplest: plain water with carbon dioxide added for bubbles. It has no added flavors, minerals, or sodium. The name comes from Selters, a German town known for naturally carbonated springs. Modern seltzer is artificially carbonated.
Club soda has minerals added to mimic natural mineral water. These typically include sodium bicarbonate (baking soda), sodium citrate, potassium sulfate, and sometimes table salt. The minerals add a subtle salty, slightly bitter flavor that some prefer.
Sparkling mineral water comes from natural springs with dissolved minerals from the source. Brands like Perrier and San Pellegrino have distinct flavors based on their mineral content. Tonic water is different entirely - it contains quinine (for bitterness) and sugar, making it about 130 calories per can.
For cocktails, bartenders generally prefer club soda over seltzer because the minerals enhance the drink's flavor profile. A gin and tonic uses tonic water specifically for its bitter quinine taste (similar pairings matter when comparing wine and champagne), while a vodka soda uses club soda for its clean, slightly mineral quality. Seltzer works best in drinks where you want pure carbonation without any added flavor, like a wine spritzer. The carbonation level also differs—seltzer and club soda typically have finer, more aggressive bubbles from forced carbonation, while natural sparkling waters like Perrier have larger, gentler bubbles.
The sodium content in club soda is worth noting for those tracking intake. A typical 12-ounce can of club soda contains 50-75 mg of sodium, compared to 0 mg in seltzer. While this is modest (the daily recommended limit is 2,300 mg), someone drinking several cans daily on a low-sodium diet should consider switching to seltzer. Learn more about how much water you should drink daily. Tonic water's calorie count is often overlooked—at about 130 calories and 32 grams of sugar per 12-ounce serving, it has nearly as much sugar as a regular cola.
Things to Know
- Flavored seltzers are still zero-calorie; flavored 'sparkling water' varies by brand.
- Sodium content in club soda is small but may matter for very low-sodium diets.
- Hard seltzer contains alcohol despite the 'seltzer' name, similar to how whiskey and bourbon are often confused.
- Carbonated water of any type can slightly erode tooth enamel over time due to carbonic acid, though the effect is far less than sugary sodas or citrus juices.