Rate of filteration of a slow sand filter ranges from -

- 1
  
  10 to 100 litres/h/m²
- 2
  
  100 to 200 litres/h/m²
- 3
  
  200 to 400 litres/h/m²
- 4
  
  400 to 1000 litres/h/m²

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