We learned that water needs purified before we can drink it. God made natural resources to help keep water pure and clean, some of which are sand and gravel.Today we made our own purification system. We each had a funnel, which we filled with three layers: cotton balls, soil and sand. We found some dirty, muddy water, which had lots of particles in it, to use for the experiment.Then we placed some alum in the water, because alum clumps the particles together. We removed the clumps of unwanted particles and the layer of sludge, which is all the particles that gather at the bottom of the cup. The water was still very black and dirty. Then we poured the dirty water into our funnels and watched the purification system at work. The water came out almost crystal clear! We were amazed!!!