File:The coagulation and filtration processes at a drinking water treatment plant. (14868618507).jpg
During filtration, water passes through filters, some made of layers of sand, gravel, and charcoal that help remove even smaller particles. Filtration and later chemical treatment (e.g., chlorine) played a role in reducing the number of waterborne disease outbreaks in the early 1900s.
|Source||The coagulation and filtration processes at a drinking water treatment plant.|
This image (or other media) is a work of an Environmental Protection Agency employee, taken or made as part of that person's official duties. As works of the U.S. federal government, all EPA images are in the public domain.
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