Changes

Slow sand filter

99 bytes added, 22:23, 21 May 2012

→‎Construction, operations and maintenance

==Construction, operations and maintenance==

[[Image:slow sand filter diagram.jpg|thumb|right|300px|Slow sand filter mechanics. Diagram: WHO.]]

The top 5 to 10 cm of wet sand must always be under oxygen rich water. Therefore, the system needs continuous water flow

Winona

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