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…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 the room to show the filter samples while talking. The water filters trap any remaining suspended solids such as particles including clays and silts, natural organic matter,…
https://www.wichita.edu/academics/fairmount_las/hugowall/efc/Project_Pages/Work_in_Water_materials/_documents/ClassroomScriptMO.docx