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Water samples and their characteristics.
| Water Sample | pH | Turbidity (NTU) |
Aluminum (mg/L) | Iron (mg/L) | Manganese (mg/L) |
|---|---|---|---|---|---|
| Gadek II WTP | 6.63 | 25.6 | 0.11 | 0.14 | 0.06 |
| Kesang River | 6.80 | 130.3 | 8.28 | 2.83 | 0.09 |
| Gadek I WTP | 5.21 | 826.3 | 75.10 | 7.70 | 0.10 |
| Gangsa River | 6.68 | 225.0 | 13.70 | 3.32 | 0.096 |
| National standard of drinking water quality [29] | 6.5–9.00 | 5.0 | 0.20 | 0.30 | 0.10 |
