Saturday, May 15th, 2021 in 2021, By Gerard J. Lynch, PE

A staple of water and wastewater treatment systems, filtration has long been a tool to help improve the quality of water. Ancient texts outline practices for purifying water for drinking, including filtering it through sand and course gravel, primarily to improve its taste. Over the centuries, sand filtration became an important process and is one of the many filtration techniques still used today. The Greek doctor Hippocrates (c. 460 – c. 370 BC) also played a role in advancing filtration technology. He is credited for inventing a crude bag filter (also known as the Hippocratic sleeve) to purify water used for his patients. Of course, bag filters are also being used as part of some water treatment systems, albeit in a much more advanced form. Read more