slow filter
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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
Filter — may refer to: Chemistry, engineering and materials In chemistry, engineering, or household usage, a device to separate mixtures. See: * Filter (chemistry) * Water filter * Air filter * Oil filter * Pneumatic filter Optics and photography In… … Wikipedia
Filter feeder — [ left|thumb|200px|Krill feeding under high phytoplankton concentration (slowed down by a factor of 12).] Filter feeders (also known as suspension feeders) are animals that feed by straining suspended matter and food particles from water,… … Wikipedia
Filter (chemistry) — In domestic food and drink preparation where bulk solids are removed from liquids, this is often called a strainer. Filtrate is the liquid produced after filtering a suspension of a solid in a liquid.Filtrand (or Residue) is the solid residue… … Wikipedia
filter — filterer, n. /fil teuhr/, n. 1. any substance, as cloth, paper, porous porcelain, or a layer of charcoal or sand, through which liquid or gas is passed to remove suspended impurities or to recover solids. 2. any device, as a tank or tube,… … Universalium
filter — fil•ter [[t]ˈfɪl tər[/t]] n. 1) chem. any substance, as cloth, paper, porous porcelain, or charcoal, through which liquid or gas is passed to remove suspended impurities or to recover solids 2) chem. any device, as a tank or tube, containing such … From formal English to slang
slow sand filter — A bed of sand through which water slowly flows; the gelatinous microbial layer on the sand grain surface removes waterborne microorganisms, particularly Giardia, by adhesion to the gel. This type of filter is used in some water purification… … Dictionary of microbiology
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
Electronic filter — Electronic filters are electronic circuits which perform signal processing functions, specifically intended to remove unwanted signal components and/or enhance wanted ones. Electronic filters can be:*passive or active *analog or digital *discrete … Wikipedia
Rapid sand filter — The rapid sand filter or rapid gravity filter is a type of filter used in water purification and is commonly used in municipal water treatment facilities. Rapid sand filters use relatively coarse sand and other granular media to remove particles… … Wikipedia
Neutral density filter — Neutral Density Filters are often used to achieve motion blur effects with slow shutter speeds In photography and optics, a neutral density filter or ND filter can be a colorless (clear) or grey filter. An ideal neutral density filter reduces… … Wikipedia
