water-purifying filter

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• filter alum — aluminum sulfate * * * filter alum, a salt used to remove suspended sediment from natural waer; aluminum sulfate. Filter alum is a common water purifying agent …   Useful english dictionary

• Filter — Fil ter, n. [F. filtre, the same word as feutre felt, LL. filtrum, feltrum, felt, fulled wool, this being used for straining liquors. See {Feuter}.] Any porous substance, as cloth, paper, sand, or charcoal, through which water or other liquid may …   The Collaborative International Dictionary of English

• Filter bed — Filter Fil ter, n. [F. filtre, the same word as feutre felt, LL. filtrum, feltrum, felt, fulled wool, this being used for straining liquors. See {Feuter}.] Any porous substance, as cloth, paper, sand, or charcoal, through which water or other… …   The Collaborative International Dictionary of English

• Filter gallery — Filter Fil ter, n. [F. filtre, the same word as feutre felt, LL. filtrum, feltrum, felt, fulled wool, this being used for straining liquors. See {Feuter}.] Any porous substance, as cloth, paper, sand, or charcoal, through which water or other… …   The Collaborative International Dictionary of English

• Water purification — This article is about large scale, municipal water purification. For portable/emergency water purification, see portable water purification. For industrial water purification, see deionized water. For distilled water, see distilled water. Water… …   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

• Constructed wetland — Vertical Flow type of Constructed Wetlands A constructed wetland or wetpark is an artificial wetland, marsh or swamp created as a new or restored habitat for native and migratory wildlife, for anthropogenic discharge such as wastewater,… …   Wikipedia

• Treatment pond — A treatment pond treats water fouled by anaerobic bacteria. It is largely used by tree nurseries, dairy farms and other agricultural companies near horse or cattle sheds or barns. The pond treats unclean rainwater and animal effluent so that it… …   Wikipedia

• Green roof — Traditional sod roofs can be seen in many places in the Faroe Islands …   Wikipedia

• environmental works — ▪ civil engineering Introduction       infrastructure that provides cities and towns with water supply, waste disposal, and pollution control services. They include extensive networks of reservoirs, pipelines, treatment systems, pumping stations …   Universalium

• Ultralight backpacking — is an advancedcitation|title=Lightweight Backpacking and Camping|author1=George Cole|author2=Ryan Jordan|author3=Alan Dixon|isbn=0974818828|date=2006] Please see the legal disclaimer in Jordan, Lightweight Backpacking and Camping , page v: not… …   Wikipedia