All of the following statements about purification of water are true except -
Spores of Clostridium are capable of surviving in water for a longer time than the coliform group of organisms. The presence of Clostridium spores in the absence of coliform group suggest faecal contamination occurred at some remote time. Park's Textbook of Preventive and Social Medicine, 25th edition, Page No. 781
Presence of Clostridial spores indicate recent contamination of water
Coliforms must not be detectable in a ny 100 ml sample of drinking water
Sodium thiosulphate is used to neutralize chlorine
Coliforms may be detected by multiple tube method & indole production
Environment and health