Parameters | |||
Classes | (mg-N/l) | (µg-N/l) | (µg-N/l) |
5 | <0.10 | 5 | 15 |
4 | 0.10 - 0.90 | 6 - 10 | 16 - 75 |
3 | 1 - 2.40 | 11 - 50 | 76 - 250 |
2 | 2.50 - 6 | 51 - 150 | 251 - 900 |
1 | >6 | >150 | >900 |