Bleach used for disinfection is typically which concentration, and what is a potential risk of using too much?

• A. Bleach is ineffective as a disinfectant
• B. Household bleach should be used undiluted for strongest effect
• C. 5.25 percent household bleach; too much can damage metal or plastics
• D. Bleach is safe on all plastics regardless of concentration

Answer: (C)

Bleach for disinfection is used at a strength that is strong enough to kill many microbes but safe for common salon surfaces when properly diluted. Household bleach is typically around 5.25% sodium hypochlorite, and it should be diluted to the recommended strength before use. Using too high a concentration can cause damage to metal and many plastics, leading to corrosion, discoloration, or surface weakening, and it can also create stronger fumes that irritate skin and the respiratory system. Always follow the product label for dilution and contact time to ensure effective disinfection without harming surfaces.