<prompt> For removal of bacteria -Rapid sand filter is more effectiveSlow sand filter is more effectiveBoth are equally effectiveRapid sand filter removes 70 bacteria  <response>: Slow sand filters are for effective in removal of bacteria. Slow sand filters remove about 99.9- 99.99.Rapid sand filters remove 98-99 bacterias. Slow sand filters occupy less area,operation is less skilled. Parks textbook of preventive and social medicine.K Park. Edition 23.Pg no: 714. 