Water treatment plant filters

Types of water filters include media filters, screen filters, disk filters, slow sand filter beds, rapid sand filters and cloth filters.

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From:http://www.cnwaterfilter.com/water_filters/Water_treatment_plant_filters.htm

Point-of-use/domestic drinking water filters
A 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 ultra-filtration membranes. Some filter units may be composite systems comprising several of these filter technologies. fitted to the main line in your house. 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.

Portable water filters
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 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.

From:http://www.cnwaterfilter.com/water_filters/Water_treatment_plant_filters.htm