That particle size ranges from under 5 �m for diatomaceous filters to well in excess of 50 �m for sand filters.
42.
Water treatment filters that can be backwashed include rapid sand filters, pressure filters and granular activated carbon ( GAC ) filters.
43.
The city of Richmond, Virginia attempted to install a slow sand filter in 1832 but the filter did not operate properly.
44.
Hazen s early work at the Lawrence Experiment Station established some of the basic parameters for the design of slow sand filters.
45.
Water from the reservoir is treated ( often using slow sand filters ) before being put into supply as London tap water.
46.
The system was developed from the slow sand filter, a technology that has been used for drinking water purification since the 1800s.
47.
The filtration rate for mechanical filtration was typically more than 60 times faster than slow sand filters, thus requiring significantly less land area.
48.
Sand filters become clogged with floc after a period in use and they are then backwashed or pressure washed to remove the floc.
49.
Much of the early work of hydrobiologists concentrated on the biological processes utilised in sewage treatment and water purification especially slow sand filters.
50.
To keep a sand filter working, depending on the size of the filter you must clean it as often as once a week.
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