| Soda Ash | Temperature | |||
| 30˚C | 60˚C | |||
| Alkali | Acid | Alkali | Acid | |
| 15 | 4/5 | 4 | 4/5 | 4 |
| 18 | 3/4 | 3 | 4/5 | 4/5 |
| 20 | 4/5 | 3/4 | 4/5 | 4/5 |