| Essays | Removal efficiency (%) (synthetic tap water) | Removal efficiency (%) (nitrates solution) |
| 1 | 85.65 | 96.53 |
| 2 | 83.89 | 95.87 |
| 3 | 86.13 | 96.11 |
| *Removal efficiency (%) | 85.22 | 96.17 |