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…step. This second step is called sedimentation.
Let samples sit for 5-ish minutes - sedimentation
The third step is called filtration, and leads the water through filters made of materials with varying densities and pore space. Filters are made of anthracite coal on top, followed by fine, medium, coarse sand, and finally gravel on the bottom. Walk around …
https://www.wichita.edu/academics/fairmount_las/hugowall/efc/Project_Pages/Work_in_Water_materials/_documents/ClassroomScriptMO.docx