This is a working model of a water filtration system. It works using some layers of materials to filter out visible impurities from dirty water. When dirty water is poured in it, it passes from each cup and at the end we get a much cleaner water.In the first stage, there are big rocks to stop the big particles. In the next stage there are small rocks to hold the smaller particles. In the third stage, there is sand which catches some of the minor particles. At last in the fourth stage there are tissue papers to absorb any left out particles in water. At the end we get much clear and filtrated water through it.