water filters - substances (such as charcoal) or fine membrane structures used to remove impurities from water.
water quality - the level of purity of water; the safety or purity of drinking water.
Water passing through activated charcoal is common in household water filters and fish tanks. Household filters for drinking water sometimes contain silver to releases silver ions which have a bactericidal effect.
Water Filter Water filters remove contaminants from untreated water through the use of a granular bed of sand or other suitable media that retains the contaminants while permitting the water to pass through.
Dear EarthTalk: Why is chlorine added to tap water? Do water filters effectively filter it out? -- J.P. Miller, Hudson, WI ...
 See also: River, Contaminant, Water, Waste, National
  
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