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Composition of contents in used TW [13].
| Components | Amount |
|---|---|
| Calcium | 91 mg/dm3 |
| Magnesium | 32 mg/dm3 |
| Sodium | 6.0 mg/dm3 |
| Potassium | 1.8 mg/dm3 |
| Chloride | 7.4 mg/dm3 |
| Sulphate | 30 mg/dm3 |
| Nitrate | 0.84 mg/dm3 |
| Hydrogen carbonate | 406.6 mg/dm3 |
| Fluoride | 0.09 mg/dm3 |
| Lead | <0.001 mg/dm3 |
