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| bio filter | |||
| aerofilter | |||
| biological filter; biofilter | |||
| trickling filter; trickling filter A system of secondary sewage treatment which is similar to self-purification action of streams; it is more accurately a biological oxidizing bed; the effluent is placed on the stones in the bed and microorganisms present consume the solids as a food supply | |||
| percolation filter; sprinkling filter | |||
| Biofilter: 3 phrases in 2 subjects |
| Construction | 2 |
| Plumbing | 1 |