November 11


Third grade is observing a homemade filtering system.  I layered sand and gravel in the top of a two liter bottle. Then I secured cheesecloth over the opening with a rubber band.  You could also use a coffee filter if cheesecloth isn’t available.  I put very muddy water through the system twice.

Filtered Water Please!

I used two layers of gravel and two of sand.

Posted November 11, 2015 by pbright2 in category Science

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