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| Impurities content (weight %) | |
|---|---|
| Insoluble in water substances | <0.01 |
| Sulfates (SO42-) | <0.01 |
| Ammonium salts (NH4+) | <0.01 |
| Aluminum (Al3+) | <0.02 |
| Iron (Fe2+) | <0.005 |
| Potassium + Sodium + Calcium (K+ + Na+ + Ca2+) | <0.05 |
| Heavy metals (Pb2+) | <0.005 |
| pH of 5%-water solution | 2 - 3 |




