Germ Illustration

Getting the Correct Concentration of Chlorine

When using household bleach (5.25% ) chlorine to disinfect, it is sometimes difficult to achieve the correct level. The following steps will take you through mixing household bleach and water to use as a disinfectant.

Note: The bleach solution should be mixed daily to preserve the strength.

Low Level Disinfectant

Utensils sanitization: 100 ppm for 45 seconds

  • Mix 2.5 ml or ½ tsp of bleach with 1000 ml or 4 cups of water.

Intermediate Level Disinfectant

For daily environmental cleaning: 200 ppm for 1 minute

  • Mix 5 ml or 1 tsp of bleach with 1000 ml or 4 cups of water.

High Level Disinfectant

Blood spills – major (One part bleach to 9 parts water): 5000 ppm for 10 minutes

  • Mix 250 ml or 1 cup of bleach with 2 L or 9 cups of water.

OR

  • Mix 125 ml or ½ cup of bleach with 1.12 L or 4 ½ cups of water.

OR

  • Mix 50 ml or ¼ cup of bleach with 450 ml or 2 ¼ cups of water.

Last modified: February 19, 2020