High TDS isn't a downside — it's the signature of a water rich in calcium, magnesium and bicarbonate. Here's why mineral-rich water is good for you.
TDS (Total Dissolved Solids) measures everything dissolved in water — mostly calcium, magnesium, sodium and bicarbonate in natural mineral water. A water rated 2,500 mg/L like Gerolsteiner carries 2.5 grams of beneficial minerals per liter. For a full primer on the categories, see TDS in bottled water →
High-TDS waters taste fuller and slightly mineral-savory — what wine writers call "structure." Low-TDS waters (Fiji, Evian) taste lighter and softer. Most newcomers find Gerolsteiner or San Pellegrino enjoyable from the first glass; very high-TDS waters like Donat Mg take a few sips to acquire.
| Brand | TDS (mg/L) |
|---|---|
| Donat Mg | 13,200 |
| Vichy Catalan | 3,052 |
| Apollinaris | 2,650 |
| Gerolsteiner | 2,500 |
| Contrex | 2,078 |
| Ferrarelle | 1,390 |
| Badoit | 1,200 |
High-TDS water from high-sodium sources (Vichy Catalan, 1,110 mg/L sodium) isn't appropriate for people on sodium-restricted diets. Very high-mineral functional waters (Donat Mg) are intended for 200–500 ml doses, not all-day drinking. For most healthy adults, high-TDS mineral water is safe, beneficial and a clean alternative to electrolyte drinks.
