Cleaning Water

We have been learning about soil.

Today we set up our own investigations to see which material is best for cleaning soil.

Each group could choose the material that they thought would best filter water with soil in it.

One group chose sand, another chose stones, a third chose cotton wool and the final group chose a coffee filter.  We think that the coffee filter cleaned the water the best, then the cotton wool, then the sand and finally the stones.

Maybe we should use a combination of all of these.