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People thought that heating water would purify it. The major motive was to be able to get better tasting water, because they could tell the difference between foul and clean water. (Ancient Greek & India)
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The Egyptians first discovered this. They applied the chemical alum for suspended particle settlememt.
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Hippocrates discovered the healing power of water. he obtained the first bag filter, which can also be called to 'Hippocratic sleeve'. This was used to trap sediments that caused bad odours or taste.
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Rome built it's first aqueducts, and Archimedes invented his water screw.
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Sir Frances Bacon started experimenting with seawater desalination. He tried to remove salt particles by means of an unsophisticated form of sand filtration. It didn't exactly work.
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These were made of wool, sponge, and charcoal.
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It was first actual municipal water Treatment plant, was designed by Robert Thom. It was built in Scotland. This particular water treatment was based on slow sand filtration.
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Cholera Epidemic spread through water. John Snow, a British scientist, found that the cause of this was water pump contamination by sewage water. He applied chlorine to purify it. However, it did not mean that it was safe to drink.
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America started to create large sand filters to protect public health. Rapid sand filtration was now applied.
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It was invented as a technique for water desalination. Cations were removed from water by exchanging them by sodium or other cations.
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They were implemented for drinking water supplies in public traffic.
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Public Health Concerns shifted from waterborne illnesses caused by disease-causing micro organisms, to anthropogenic water pollution.
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Safe Drinking Water Act Was formulated. They developed that every person in the world had the right to drink clean water.
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Membrane development for reverse osmosis was added to the list.
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Risk assessments were enabled after 1990.