Our clean water experment

In class 612" The hleping hand", we have learn how do clean water. We divided into four group, to try clean water. I learn about people have to working to water.First we need to bring a big bottle. My group use the material have: spongs, cotton ball, charcaol, and the coffee filter. Then we put dirty water into these material, but the result is only some leave and small stone was clean, the water's color was not change. For this experiment, I learn about the the water was so difficult to clean. In real life, we need mountain water clean.