Social & Preventive Medicine General 53bcde95 Strength of phenol used in disinfecting faeces is: A 5% B 6% C 8% D 10% High-Yield Explanation Agents used for disinfecting faeces: DISINFECTANT % USED Bleaching powder 5 Phenol 10 Cresol 5 Formalin 10 Ref: Park 21st edition, page 119.