Sampling points | Before treatment (mg/l) | After treatment (mg/l) | Percentage reduction (%) | Average (%) |
P1 | 5.09 | 1.26 | 75.25 | 81.64 |
P2 | 10.34 | 1.89 | 81.72 | |
P3 | 13.27 | 1.60 | 87.94 |