Social & Preventive Medicine 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 a ny 100 ml sample of drinking water C Sodium thiosulphate is used to neutralize chlorine D Coliforms may be detected by multiple tube method & indole production 💡 Explanation All of the following statements about purification of water are true except - ✓ Correct Answer: A. Presence of Clostridial spores indicate recent contamination of water