For decontamination of clothing and equipment, what is the correct bleach concentration?

• A. 0.5%
• B. 1%
• C. 5%
• D. 10%

Answer: (C)

Using a bleach solution that is strong enough to reliably inactivate contaminants but not so harsh that it damages fabrics is essential for decontaminating clothing and equipment. Five percent sodium hypochlorite provides that balance: it is a widely available strength that delivers effective broad-spectrum antimicrobial action, helping to reduce the microbial load quickly when materials are thoroughly wetted and left in contact for the recommended time. Lower concentrations may not achieve the same level of inactivation for certain organisms, while higher concentrations can damage fabrics and increase safety risks. After treatment, rinse well and allow to air dry under proper safety precautions.