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

  • 0.01 to 0.05 ppm
  • 0.05 to 0.5 ppm
  • 0.5 to 1.0 ppm
  • 1.0 to 5.0 ppm
Answer: 0.05 to 0.5 ppm
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