As compared to rapid sand filters, slow sand filters give

i) slower filtration rate

ii) higher filtration rate

iii) lesser efficiency in removal of bacteria

iv) higher efficiency in removal of bacteria

the correct answer is

- 1
  
  (i) and (ii)
- 2
  
  (ii) and (iii)
- 3
  
  (i) and (iv)
- 4
  
  (ii) and (iv)

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