Water Filters

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. more...

Uses

Water can be cleaned using a variety of different types of water filters, both for drinking and other purposes. Filtration forms a key stage in many waste water and drinking water treatement systems. In the case of drinking water, filtration tends to be carried out by the supplier prior to the water's entry into the distribution system. Additional filtration may be carried out by consumers at their premises using any of several types of domestic water filter.

Domestic water filters are primarily used to remove chemicals and metals such as chlorine and lead. Water filters can be used for preventative health reasons in the case of harmful substances, or for reasons of aesthetics, to improve the taste, colour or odour of drinking water. Domestic water filters can be attached directly to a tap, attached to the domestic water supply before the tap, or filters can be used at the point of use or in a portable unit.

Methods of filtration

The 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.

Types of filters

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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