A water filter is an impurity-removal system that removes pollutants from water by the use of a fine physical barrier, a chemical reaction, or a biological reaction. The goal of water filtration is to offer safe drinking water to the public at large. Water filters can be used for agricultural irrigation, readily available drinking water, public and private aquariums, and the safe use of ponds and swimming pools. Filtration of water may help us avoid the pain and suffering caused by a variety of ailments. With the proper water filter, contaminants such as lead from ancient water pipes, pesticide runoff in rural areas, and byproducts of chemicals such as chlorine can be reduced even further. Installing a clean water filter in your house is less costly and far less harmful to the environment than purchasing bottled water.