| Parameter | Level | ||
| 1 | 2 | 3 | |
| Acid concentration (gr/l) | 40 | 80 | 120 |
| Time (minute) | 60 | 90 | 120 |
| Temperature (Celsius) | 40 | 60 | 80 |
| Pulp density (gr/l) | 100 | 150 | 200 |