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filtration gravel

См. также в других словарях:

  • under-gravel filter — an aquarium filter providing both mechanical and biological filtration. It consists of a perforated plate placed on the bottom of the aquarium and then covered in gravel. Water is pulled through the gravel, under the plate, and up through lift… …   Dictionary of ichthyology

  • Substrate (aquarium) — Gravel in a freshwater aquarium The substrate of an aquarium refers to the material used on the tank bottom. It can affect water chemistry, filtration, and the well being of the aquarium s inhabitants, and is also an important part of the… …   Wikipedia

  • Filter (aquarium) — Aquarium filters are critical components of both freshwater and marine aquaria.cite book |last=Riehl |first=Rüdiger. Editor. |coauthors=Baensch, HA |title=Aquarium Atlas |year=1996. 5th Edn. |publisher=Tetra Press |location=Germany |isbn=3 88244… …   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

  • Freshwater aquarium — A freshwater aquarium is a receptacle that holds one or more freshwater aquatic organisms for decorative, pet keeping, or research purposes. Modern aquariums are most often made from transparent glass or acrylic glass. Typical inhabitants include …   Wikipedia

  • 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

  • BioSand Filter — BioSand Water Filters are a technological adaptation of the centuries old slow sand filtration process. While implementations exist in many different sizes and varieties, the most common design is intended for use in rural homes where naturally… …   Wikipedia

  • Swimming pool sanitation — articleissues refimprove = January 2008 technical = August 2008Swimming pool sanitation refers to both visual clarity and levels of microflora, such as bacteria and viruses in swimming pools. The goal of sanitation is to prevent the spread of… …   Wikipedia

  • Construction of the Trans-Alaska Pipeline System — The construction of the Trans Alaska Pipeline System was a massive undertaking involving tens of thousands of people often in extreme temperatures and conditions. Specialized construction techniques were pioneered to build the pipeline, most of… …   Wikipedia

  • Slow sand filter — Slow sand filters are used in water purification for treating raw water to produce a potable product. They are typically 1 to 2 metres deep, can be rectangular or cylindrical in cross section and are used primarily to treat surface water. The… …   Wikipedia

  • Natural pool — This German swimming pond highlights how NSPs can be designed to resemble a part of the surrounding environs …   Wikipedia

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