1Liter of muddy water (make your own by mixing dirt or mud into water)
1Cut off the bottom of the plastic bottle with scissors (keep the cap on).
2Stuff cotton balls into the neck of the bottle.
3Crush the activated charcoal (optional, but it will work best this way).
4Pour it into the bottle.
5Next add the sand to the bottle.
6Then add the gravel.
7Loosen the cap and set your water filtration system on top of the plastic cup
8Gently add muddy water into the top.
9Observe what happens as the muddy water is filtered.
Warning:Do not drink this water, it is not filtered enough for that.
Tip:Activated charcoal is available at pet stores or can be bought online.
How It Works
Muddy water goes through three different stages of filtration in our system. First, large particles are separated from the water as they pass through the rocks. Then, smaller particles are removed when they pass through the sand. Finally, the water passes through the activated charcoal, where the smallest particles are removed and some chemicals are removed as well. The cotton balls make sure that the activated charcoal stays in the bottle. By going through each of these steps, the muddy water gets cleaner and cleaner. However, in order to make drinking quality water it has to go through more steps, so don't drink this water.
Check out the Full Lesson on Water Quality & Distribution!
In this lesson, we learn that:
97 percent of Earth's water is in oceans.
Plants and animals depend on clean water to survive.
Humans can negatively affect water quality even if they live far away from it.