Social & Preventive Medicine Which of the following is not true about water quality estimation – A Chlostridium spores indicate recent contamination B Not more than 5% samples should have coliforms C Sodium thiosulfate added to neutralize chlorine D Coliforms must not be detected in 100 ml sample 💡 Explanation Which of the following is not true about water quality estimation - ✓ Correct Answer: A. Chlostridium spores indicate recent contamination