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| Impurities content (weight %) | |
|---|---|
| Insoluble in water substances | <0.005 |
| Nitrates (NO3-) | <0.001 |
| Phosphates (PO43-) | <0.001 |
| Sulfates (SO42-) | <0.01 |
| Barium (Ba2+) | <0.002 |
| Iron (Fe2+) | <0.002 |
| Calcium (Ca2+) | <0.002 |
| Heavy metals (Pb2+) | <0.001 |
| Sodium + Potassium (Na+ + K+) | <0.08 |



