| |||
percolating filter | |||
trickling filter | |||
trickling filter (Tropfkörperreaktor/ Rieselfilmreaktor) | |||
biofilter | |||
bacterial bed; biological filter | |||
contact aerator | |||
percolation filter; sprinkling filter | |||
| |||
plastic filled trickling filter |
Tropfkörper: 12 phrases in 3 subjects |
Construction | 2 |
Environment | 5 |
Natural resourses and wildlife conservation | 5 |