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2. Backwashing (water treatment) - Wikipedia

   en.wikipedia.org/wiki/Backwashing_(water_treatment)

   The backwash cycle is triggered after a set time interval, when the filter effluent turbidity is greater than a treatment guideline or when the differential pressure across the filter exceeds a set value. Water treatment filters that can be backwashed include rapid sand filters, water softening systems, pressure filters and granular activated ...

3. Water purification - Wikipedia

   en.wikipedia.org/wiki/Water_purification

   The Metropolitan Commission of Sewers was formed at the same time, water filtration was adopted throughout the country, and new water intakes on the Thames were established above Teddington Lock. Automatic pressure filters, where the water is forced under pressure through the filtration system, were innovated in 1899 in England. [37]

4. Biosand filter - Wikipedia

   en.wikipedia.org/wiki/BioSand_Filter

   The system was developed from the slow sand filter, a technology that has been used for drinking water purification since the 1800s. [3] Initial lab and field tests were conducted in 1991; the system was patented in 1993 [ 4 ] and was implemented in the field in Nicaragua .

5. Slingshot (water vapor distillation system) - Wikipedia

   en.wikipedia.org/wiki/Slingshot_(water_vapor...

   Slingshot is a water purification device created by inventor Dean Kamen. [1] Powered by a Stirling engine running on a combustible fuel source, it claims to be able to produce drinking water from almost any source [2] by means of vapor compression distillation, [3] requires no filters, and can operate using cow dung as fuel.

6. Flint water crisis - Wikipedia

   en.wikipedia.org/wiki/Flint_water_crisis

   The EPA issued a Safe Drinking Water Act Emergency Order and took over collecting and testing of water samples, while ordering state agencies to send them previously collected data, on January 21. [280] A week later they advised residents to continue using water filters and drink only bottled water. [281]

7. History of municipal treatment of drinking water - Wikipedia

   en.wikipedia.org/wiki/History_of_municipal...

   Water closets could now empty into the cities sewer which in turn emptied into the Thames. [8] This was a disaster for the river. In 1816 salmon could be caught in the Thames, four years later none could be caught. The water closet overloaded the medieval cesspool system which was still in use. The use of water to dispose of sewage in the water ...