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| English | Estonian |
| acoustic filter A device employed to reject sound in a particular range of frequencies while passing sound in another range of frequencies | akustiline filter |
| filter cake Accumulated solids, wet or dry, generated by any filtration process, including accumulation on fabric filters in air filtering processes, or accumulation of wet solids in liquid filtering processes | filtrikook |
| 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 | biofilter |