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Encyclopedia > Filter (water)
An industrial water filter with geared motor

A water filter is a device which removes impurities from water by means of a fine physical barrier, chemical processes and/or biological process. Filters are used to cleanse water for irrigation, drinking water, aquariums, and swimming pools. Image File history File links Download high-resolution version (1000x742, 122 KB) An industrial filter with gear motor, published with friendly permission by Taprogge GmbH Germany (mail:infokLaMmerafFtaprogge. ... Image File history File links Download high-resolution version (1000x742, 122 KB) An industrial filter with gear motor, published with friendly permission by Taprogge GmbH Germany (mail:infokLaMmerafFtaprogge. ... Impact from a water drop causes an upward rebound jet surrounded by circular capillary waves. ... Irrigation is the artificial application of water to the soil usually for assisting in growing crops. ... Drinking water Mineral Water Drinking water is water that is intended to be ingested by humans. ... “Aquaria” redirects here. ... This article needs additional references or sources for verification. ...


Water filters are primarily used to soften water and remove chemicals such as chlorine. Some scientists believe that the contaminants found in drinking unfiltered drinking water can be harmful to your health, even increasing the risk of developing cancer. The most common problem with unfiltered water, however, is a bad taste or smell. General Name, symbol, number chlorine, Cl, 17 Chemical series halogens Group, period, block 17, 3, p Appearance yellowish green Standard atomic weight 35. ...


Water filters are also used by recreational hikers, by aid organizations during humanitarian emergencies, and by the military. These filters are usually small, portable and light (1-2 pounds or less) and usually filter water by working a mechanical hand pump, although some use a siphon drip system to force water through. Dirty water is pumped via a screen-filtered flexible silicon tube through a specialized filter, ending up in a water bottle (or other container, such as a Camel Back). These types of filters work to remove bacteria, protozoa and cysts, all of which can cause disease. Popular and reliable makers of these small, portable water filters include General Ecology, Innova Pure Water, Katadyn,Mountain Safety Research, and Pure Water 2GO. Filters include fine meshes, which must be replaced, and ceramic filters which must have their outside abraded off when it becomes clogged with impurities. Not to be confused with Psiphon. ... MSR WindPro portable stove with heat reflector and wind shield An MSR propane/isobutane fuel canister and portable stove in operaton Mountain Safety Research, or MSR, was founded in 1969 by Larry Penberthy because he was not pleased with the safety and reliability of outdoor eqipment. ... Fixed Partial Denture, or Bridge The word ceramic is derived from the Greek word κεραμικός (keramikos). ...


These water filters should not be confused with devices or tablets that are water purifiers. Water purifiers satisfy higher EPA standards, and also remove viruses, such as hepatitis A and rotavirus, among others. Chemical, Elevated, Hydropneumatic and Ground Storage Water Tanks shown together in one installation. ...


In a domestic emergency, where water needs will last beyond those of stored, bottled water, a device that is specifically certified as a water purifier, and not a water filter, is preferred.


The physics of filters is based on sieving, adsorption, ion exchanges and other processes. Unlike a sieve or screen, a filter can remove particles much smaller than the holes through which the water passes. Adsorption is a process that occurs when a gas or liquid solute accumulates on the surface of a solid or, more rarely, a liquid (adsorbent), forming a molecular or atomic film (the adsorbate). ... Ion exchange is defined as an exchange of ions between two electrolytes. ... In general, a sieve separates wanted/desired elements from unwanted material using a tool such as a mesh, net or other filtration or distillation methods. ... The term screen has a number of meanings: A window screen is a wire mesh that covers a window opening to keep out insects even when the window is open. ...


Examples

A media filter is a type of filter utilizing a bed of sand, crushed granite or other material to filter water for drinking, swimming pools, aquaculture, irrigation, and other applications. ... A screen filter is a type of filter utilizing a rigid or flexible screen to separate sand and other fine particles out of water for irrigation or other applications. ... A disk filter is a type of water filter similar to a screen filter, except that the filter cartridge is made of a number of disks stacked on top of each other like a pile of poker chips. ... Slow sand filter beds are used in water purification for treating raw water to produce a potable product. ... The rapid sand filter or rapid gravity filter is a type of filter used in the purification of water and is commonly used in municipal water treatment facilities. ... Developed for use in Bangladesh, the cloth filter is a simple and cost-effective appropriate technology method for reducing the contamination of drinking water. ...

See also

Backwash is the backwards flow of air or water. ... Control room and schematics of the water purification plant to Bret lake. ... Reverse osmosis is a separation process that uses pressure to force a solvent through a membrane that retains the solute on one side and allows the pure solvent to pass to the other side. ... Laboratory distillation set-up: 1: Heat source 2: Still pot 3: Still head 4: Thermometer/Boiling point temperature 5: Condenser 6: Cooling water in 7: Cooling water out 8: Distillate/receiving flask 9: Vacuum/gas inlet 10: Still receiver 11: Heat control 12: Stirrer speed control 13: Stirrer/heat plate... A sand separator or hydrocyclone is a device which utilizes centrifugal force to separate sand or other heavy particles out of water. ... A settling basin, settling pond or decant pond is a place where very fine particles from water are removed by means of gravity. ... This article does not cite any references or sources. ...

External links


  Results from FactBites:
 
Filter (water) - Wikipedia, the free encyclopedia (358 words)
A water filter is a device which removes impurities from water by means of a fine physical barrier, chemical processes and or biological process.
Filters are used to cleanse water for irrigation, drinking water, aquariums, and swimming pools.
Water filters are primarily used to soften water and remove chemicals such as chlorine.
Drinking Water Filters, Shower Water Filters, Filtration Systems, Water Filter (547 words)
Under the sink water filters are typically used where cabinet space is available under the kitchen sink and a permenant installation is desired.
Countertop water filters are typically used when a temporary installation is desired, such as in apartments, in a vacation cabin, or where a faucet hole is not available for an under sink installation, or where under the counter space is not available.
Filtered water coolers provide hot and cold water that is fresh and clean, with no need for those heavy water bottles.
  More results at FactBites »

 
 

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