Water purification is the process of removing undesirable
chemicals, materials, and biological contaminants from raw
The goal is to produce water fit for a specific purpose.
Most water is purified for human consumption (drinking water) .
In general the methods used include physical process such as filtration and sedimentation, biological processes such as slow sand filters or activated sludge, chemical process such as flocculation and chlorination and the use of electromagnetic radiation such as ultraviolet light.