The amount of residual chlorine left in public water supply for safety against pathogenic bacteria is about

- 1
  
  0.01 to 0.05 ppm
- 2
  
  0.05 to 0.5 ppm
- 3
  
  0.5 to 1.0 ppm
- 4
  
  1.0 to 5.0 ppm

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