The effective size (ES) of sand and its uniformity coefficient (UC) are the usually specified paraments for sand filters. In slow sand filters, as compared to repid sand filters.

- 1
  
  ES is less but UC is more
- 2
  
  ES is more but UC is less
- 3
  
  Both ES and UC are mroe
- 4
  
  Both ES and UC are less

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