Eternal – Smoky Mountain, TN is a still water from USA. Calcium-bicarbonate type, low mineralization.
| Ion | mg/L |
|---|---|
| Calcium (Ca²⁺) | 19 |
| Magnesium (Mg²⁺) | 11 |
| Sodium (Na⁺) | 0.6 |
| Chloride (Cl⁻) | 0 |
| Sulfate (SO₄²⁻) | 6.1 |
| Bicarbonate (HCO₃⁻) | 104.9 |
| At a glance | |
|---|---|
| Total of these six minerals | 141.6 mg/L |
| Total hardness (as CaCO₃) | 92.7 mg/L |
| Alkalinity (as CaCO₃) | 86 mg/L |
| Sulfate-to-chloride ratio | – |
Mineral salts to dissolve in reverse-osmosis or distilled water, calculated by the BrewWaterSolver solver with the most common homebrew salts.
| Salt | 5 gal (18.9 L) | 20 L |
|---|---|---|
| Epsom salt (MgSO₄) | 0.33 g | 0.35 g |
| Chalk (CaCO₃) | 0.94 g | 0.99 g |
| Baking soda (NaHCO₃) | 0.06 g | 0.07 g |
Closest match with these salts; it can't reach Mg 2.7 mg/L vs 11, HCO3 66 mg/L vs 104.9 exactly.
Chalk (CaCO₃) doesn't dissolve well directly in mash or sparge water without dissolved CO₂ - slurry it in carbonated water (e.g. sparkling water) before adding it, rather than mixing it into still water or sprinkling it in dry, or the calculated amount may not fully dissolve. How to dissolve chalk with CO₂
Proffit Spring Source (Newport Springs Bottling), Great Smoky Mountains, Tennessee. Values from brand website. Analysis/label date: 2026 Bottled Water Quality Report. Report prints bicarbonate as CaCO3 (equal to alkalinity); converted x1.22 to HCO3.