Feature of slow filter (w.r.t. fast filter) is/are : a) Occupies less spaceb) Highly skilled operationc) Poor bacterial qualityd) Takes more time for purificatione) Size of sand is smaller

Slow sand filter occupies large area (more space). Slow and filter requires less skilled operation. Slow sand filter removes more bacteria and has better bacterial control (99.9-99.99%) Slow sand filter requires longer duration for purification. Size of sand is smaller (0.2-0.3 mm).