![](/sites/default/files/reference_icons/WHO%201996%20Factsheet.jpg)
A factsheet on slow sand filters work compiled by the WHO. It includes a paragraph on how sanitary inspections of rapid sand filters should be conducted.
WHO (1996): Rapid Sand Filtration. (= Fact Sheets on Environmental Sanitation , 2 / 14 ). Geneva: World Health Organization (WHO) URL [Accessed: 15.02.2012]