| Contact time (Days) | Experiment I | Experiment II | Experiment III |
| % Removed | % Removed | % Removed | |
| 1 | 7.326 | 6.006 | 6.684 |
| 2 | 57.293 | 56.939 | 59.759 |
| 3 | 75.662 | 74.756 | 72.977 |
| 4 | 97.021 | 96.974 | 96.886 |
| 5 | 88.332 | 86.984 | 86.853 |
| 6 | 87.156 | 86.957 | 86.676 |
| 7 | 87.007 | 86.399 | 85.999 |