Sand doesn't do a very good job.
Sand and Soil did noticeably better...
Looks like pee, but the liquid is much more clear.
Sand plus Gravel and Soil didn't do as well as we expected.
Looks somewhat murky, right?
Sand plus Gravel plus Soil and Grass wasn't experimented on until two days later, and yet...
You could see it was much more filtered if you looked at it at the right angle.
[This lab was to see how well sand, gravel, soil, and grass filter water solutions.]
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