A water filter removes impurities from water by means of a fine physical barrier, a chemical process or a
biological process. Filters cleanse water to various extents for irrigation, drinking water, aquariums, and swimming pools.
Filters use 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.
http://en.wikipedia.org/wiki/Water_filter
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