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| Impurities content (weight %) | |
|---|---|
| Insoluble in water substances | <0.005 |
| Alkalinity (NaOH) | <0.05 |
| Total Nitrogen (N) | <0.0005 |
| Sulfates (SO42-) | <0.001 |
| Phosphates (PO43-) | <0.0003 |
| Chlorides (Cl-) | <0.0005 |
| Aluminum (Al3+) | <0.0005 |
| Iron (Fe2+) | <0.0002 |
| Potassium (K+) | <0.001 |
| Calcium + Magnesium (Ca2+ + Mg2+) | <0.004 |
| Arsenic (As3+) | <0.00001 |
| Heavy metals (Pb2+) | <0.0002 |
| Crystallization water (H2O) | <0.2 |



