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General Medicine General 6cfbc54b

All of the following statements about purification of water are true except :

A
Presence of Clostridial spores indicate recent contamination of water
B
Coliforms must not be detectable in any 10 ml sample of drinking water
C
Sodium thiosulphate is used to neutralize chlorine.
D
Coliforms may be detected by multiple method & indole production

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