percolating biofilter

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Trickling filter — A trickling filter consists of a fixed bed of rocks, gravel, slag, polyurethane foam, sphagnum peat moss, or plastic media over which sewage or other wastewater flows downward and causes a layer or film of microbial slime to grow, covering the… … Wikipedia
Lava filter — A lava filter is a biological filter that uses lavastone pebbles as support material on which microorganisms can grow in a thin biofilm. [ [http://www.stowa selectedtechnologies.nl/Sheets/Sheets/Lava.Filters.html Overview of lavafilters] ] This… … Wikipedia

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