Water filter

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.

Contents 1 Methods of filtration 2 Types of filters 2.1 Water treatment plant filters 2.2 Point-of-use filters 2.3 Portable water filters 2.4 Homemade water filters 3 Water polishing 4 See also A large-scale flocculation water filter 5 References

Methods of filtration

Main article: Filtration

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.