Present Day Water Filtration Practice

摘要

It is now eighty-five years since the first municipal water filter was built at London, and this filter was built to perform only the functions of a mechanical strainer for the removal of suspended matter.... Doubtless even the earliest water filters were of considerable sanitary benefit, but the first official recognition of water filtration as a means of reducing the dangers in impure drinking water followed the severe cholera epidemic of 1849. This took the form of an act of Parliament (1852) which made compulsory the filtration of the entire water supply of the Metropolitan District of London....