Water is the driving force of all nature - Leonardo da VinciWater is a nutrient, which is imperative to human life, and it is an elementary constituent in the economic potency of any nation. The adequate water supply of apposite superiority is a key ingredient in the health of humans and the ecosystem. Various practices of human beings cause a perilous effect on the ecosystem and particularly to the quality of water. This book focuses on the development of Hydroxyapatite based porous materials for the eradication of a range of contaminants from water bodies.