French ⇄ Bulgarian Czech Danish Dutch English Finnish German Greek Italian Polish Romanian Russian Spanish Swedish

lit filtrant
chem.	filtering layer; filtrating layer; filter bed; clarification bed
construct.	filter filling; filter loading; filtering charge; filtering mass; filtering body
lit-filtre
environ.	filter bed; filter sand bearer
lits filtrants
construct.	filter beds

lit filtrant: 9 phrases in 4 subjects

Construction	2
Environment	4
Natural resourses and wildlife conservation	1
Technology	2