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Filtering Experiment – can you do better?

July 12, 2013 By Emma Vanstone 8 Comments

We’ve tried a filtering experiment using dirty water before, using kitchen roll as the filter. Today we tried something a little different.

We looked in the garden for three things that might make good filters, and chose large stones, small stones and sand. We talked about which we though would be the best filter, and decided the sand would probably work best as it was the smallest.

Filtering Experiment

What you need

  • Large stones
  • Small Stones
  • Sand
  • Containers
  • Funnel
  • Dirty water – we just added some soil from the garden to some tap water.

filtering experiment

Instructions

  • Place the large stones in the funnel and hold it over a container, pour the water through.
  • Add the small stones to the top of the large stones and repeat, does the water look clearer?
  • Add the sand and repeat again.

 

Our results were not as clear as I had hoped. You can see that the water filtered by all three materials is slightly clearer than the first two, but some sand seems to have dropped through the funnel.

 

filtering experiment

DSC_0134

 

How to improve

We need to use a bigger funnel so we can have more of each material to make the filtering is better. This should also stop the sand dropping through into the water.

Do let us know if you try a filtering experiment yourself, we’d love to hear about how you got on.

Suitable for Key stage 2 Science

Properties and Changes of Materials

Use knowledge of solids, liquids and gases to decide how mixtures might be separated, including through filtering, sieving and evaporating.

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Filed Under: Chemistry for kids Tagged With: Filtering, fun science for kids, kids experiments, making science fun, Science Sparks

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Reader Interactions

Comments

  1. JDaniel4's Mom

    July 12, 2013 at 12:16 pm

    This would be great to try with my son. Thanks!

    Reply
    • ScienceSparks

      July 14, 2013 at 9:18 pm

      Let us know how you get on 🙂

      Reply
    • ScienceSparks

      July 14, 2013 at 9:21 pm

      It was a lot of fun! Let us know how you get on 🙂

      Reply
  2. sarahelisabeth

    July 12, 2013 at 4:15 pm

    How about using this system with a coffee filter in the funnel?We’ve tried re-filtering before which also helps.

    I think we will try the combined idea!

    Reply
    • ScienceSparks

      July 14, 2013 at 9:25 pm

      Thats a great idea, I will try that!

      Reply
  3. Natalie

    July 12, 2013 at 5:24 pm

    Very cool experiment. We definitely need to do some filtering experiments later this year!

    Reply
    • ScienceSparks

      July 14, 2013 at 9:27 pm

      It was a lot of fun.

      Reply

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  1. Water Websites | ourgradeblog says:
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