Edible Science: How make a Water Purifier

Have you ever wondered how make water purifier? We decided this week that it would be fun to make a basic water filter and see if we could make drinkable water.  Honestly, it did not work out quite like we thought but we did learn how it worked. In a bind, this is a way to purify water however based on our experiment we couldn’t  purify enough water to sustain even one person.

What you need:

  • How make Water PurifierBowl
  • Water
  • Food coloring
  • Rock
  • Saran Wrap
  • Tape 
  • Coffee cup, smaller than bowl

What you do:

  1. How make Water PurifierIn a large bowl add water, a few drops food coloring and some salt
  2. Mix or just swirl it around
  3. Place a coffee cup or heavy cup in the middle of a bowl. Make sure the colored salt water is below the edge of the cup.
  4. Place Saran Wrap on the bowl and tape to the bowl. You want  the Saran wrap to slant toward the coffee cup.
  5. Now place a small rock in the middle of the Saran Wrap.
  6. Place in Direct sun for a day or two.

What we found out:

We had to tape the Saran Wrap to make sure it stayed in place in the outside elements.  A short coffee cup works great because of it heavier than water and will sink to the bottom.  A Sunny day would be the best for this project but we actually let ours sit in the sun for 2 days. We only got enough water for a swallow or two but the water was clear with no salt.  In the first video, the girls thought the water tasted like dirt. We used unfiltered water and I think it just tasted bad in general.

How it works

As the Sun warms up the water the water molecules begin to evaporate. The evaporated water floats to the surface and lands on the Saran Wrap.  The evaporated water condenses, or turns back into water and drips down the Saran Wrap into the cup. Since the Salt and food coloring are denser than water it stays in the bowl. When you drink the water is should be nice clean and clear water.

About Chrissie

Follow our crazy journey across America as we visit roadside oddities, historical land marks and beautiful landscapes. I have ton of ideas and review educational products that will help you get the most on your home school adventure. We are an Unschool family that believes the world is our classroom and is teaching our children to self direct their education to a better future.