Water Filter Science Experiment

This week for Science we did a water cleaning experiment. My friend Sophie and I did one in a group. Everyone had options to choose from out of bark, sand, cotton balls, and paper towels each group was given two containers, one with a hole in it and one without a hole. You put the one with the hole on the top and the other one on the bottom. In the top container, we put cotton balls and paper towels after we put them in we poured dirty water in.
the last step was to wait for the water to drain. But in the end, 
the water is still not drinkable. Here is how the water filters turned out.