Water is very essential for life. It is important for human beings, animals, plants and other living organisms to perform their life activities. This note provides information about water, sources of water, physical and chemical properties of water and its uses.
Hard water is a type of water which cannot form lather with soap and soft water is a type of water which can form lather with soap. This note provides information about hard water and soft water. It also provides information about removal of temporary hardness and permanent hardness of water.