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A water filter is a device which removes impurities from water by means of a fine physical barrier, chemical process and/or biological process. Filters are used to cleanse water for irrigation, drinking water, aquariums, and swimming pools.
[edit] Useswe would like to welcome everyone from balbriggan communtiy colege ...lenny [edit] Methods of filtrationThe physics of water 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.tara shanley sucks balls OH THE WATER IS FROM RESERVES IN SHIT!!! OMG LIKE YEH DUDE!!!!!!!! HEHEHEHEHHEHEHEHEHEHEHEHEHEHEHEHEEHEH [edit] Types of filters[edit] Water treatment plant filtersTypes of water filters include media filters, screen filters, disk filters, slow sand filter beds, rapid sand filters and cloth filters.[1] [edit] Point-of-use/domestic drinking water filtersA number of different filter types are available for use in the home, including granular activated carbon filters (GAC), metallic alloy filters, microporous ceramic filters, carbon block resin (CBR) and ultrafiltration membranes. Some filter units may be composite systems comprising several of these filter technologies. Jug filters can be used for small quantities of water for drinking. Some kettles have such filters built in, predominantly to reduce the effects of limescale. [edit] Portable water filtersWater 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/0.5-1.0 kg or less) and usually filter water by working a mechanical hand pump, although some use a siphon drip system to force water through while others are built right into water bottles. Dirty water is pumped via a screen-filtered flexible silicon tube through a specialized filter, ending up in a container. These types of filters work to remove bacteria, protozoa and microbial cysts, all of which can cause disease. Filters include fine meshes, which must be replaced, and ceramic water filters which must have their outside abraded off when it becomes clogged with impurities. These water filters should not be confused with devices or tablets that are water purifiers. Some of these devices have the ability to remove or kill viruses such as hepatitis A and rotavirus. [edit] Homemade water filters
Water filters can also be made on-site, using locally available materials such as grass, charcoal (eg from burned firewood) and sand. These filters have been used by soldiers, and outdoor enthusiasts.[2] Due to their low cost, they can be made/used by anyone, including the poor, who often do not have access to safe drinking water. [edit] See also
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