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biological filter
agric.	biologischer Filter
ecol.	Rieselbettreaktor m; Rieselstromreaktor m; Tropfkörper m; Biofilter n
environ.	Bakterienfilter m; bakteriendichter Filter; Tropfkörperanlage f
biological filtering
environ.	biologische Filtrierung

biological filter: 7 phrases in 3 subjects

Construction	4
Environment	2
Plumbing	1