Sampling points | Before treatment (mg/l) | After treatment (mg/l) | Percentage reduction (%) | Average (%) |
P1 | 4.93 | 1.03 | 79.11 | 81.08 |
P2 | 10.32 | 1.79 | 82.66 | |
P3 | 13.12 | 2.43 | 81.48 |