Slow sand filter

Original map by John Snow showing the clusters of cholera cases in the London epidemic of 1854.

The raw water is let in to the filter room slowly from the pipe on the right. The water will pass through the sand layers down to the bottom of this room. The Schmutzdecke layer can be observed in this picture.

Slow sand filters are used in water purification for treating raw water to produce a potable product. They are typically 1 to 2 metres deep, can be rectangular or cylindrical in cross section and are used primarily to treat surface water. The length and breadth of the tanks are determined by the flow rate desired by the filters, which typically have a loading rate of 0.1 to 0.2 metres per hour (or cubic metres per square metre per hour).

单词	Slow sand filter
释义	Slow sand filter 英语百科 Slow sand filter Slow sand filters are used in water purification for treating raw water to produce a potable product. They are typically 1 to 2 metres deep, can be rectangular or cylindrical in cross section and are used primarily to treat surface water. The length and breadth of the tanks are determined by the flow rate desired by the filters, which typically have a loading rate of 0.1 to 0.2 metres per hour (or cubic metres per square metre per hour).
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