Every living thing needs water to be able to live.Our civilization is built on the use of water. Even centuries ago people used a lot of water as we use it up to now and it is hard imagine how we’d live in the future without it. We need water for: watering plants,bathing,cooking,feeding animals,to keep our places and dishes clean and for drinking. In the past people did not understand the importance of sanitation until 19th century. A lot of people were in trouble by pathogens transmitted from polluted water (“History of water and health”). People start to think about cleaning water to drink.The first experiment to clean drinking water was with sand to clean seawater,this idea gave Sir Francis.Experiment failed but it gave forward way for studies.Sand filters in 1804,was the first step to filter water.