Q. Slow sand or biological filtration of water is introduced in Scotland in

A
1904
B
1804
C
1704
D
1924
Solution:

Slow sand filters are used in water purification for treating raw water to produce a potable product. The use of sand filters to purify the water supply dates to 1804, when the owner of a bleachery in Paisley, Scotland, John Gibb, installed an experimental filter, selling his unwanted surplus to the public.

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