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General Medicine General d12cff66

All of the following statements about purification of water are true, EXCEPT:

A
Level of residual chlorine in water should be 0.5 mg / L
B
Presence of Clostridium spores indicates recent contamination
C
Coliforms must not be detectable in any 100 ml sample of drinking water
D
Coliforms may be detected by multiple tube method and indole production

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