Recipe for chlorine bleach solution

Low level disinfection:

Surfaces within the school environment generally require a low level of disinfection.

Concentration: 200 parts per million
Contact time: surface must remain wet for 1 minute

High level disinfection:

Use in areas contaminated with blood/body fluid spills to prevent transmission of diseases.

Concentration: 5000 parts per million
Contact time: surface to remain wet for 10 minutes

Easy to use online Chlorine Dilution Calculator (Public Health Ontario)

Enter the:

• Volume of solution required
• Desired concentration of sodium hypochlorite
• Concentration of bleach solution being used (found on the label of the bleach product)
• Press ‘enter’

The tool will automatically calculate the amount of bleach solution that should be diluted with water to get the desired concentration.