Explore Chlorine Disinfection

A collection of short e-learning tools and job aids to help humanitarian and development workers test the quality of drinking water under field conditions.

Learn About Chlorine

A collection of short e-learning tools and job aids to help water technicians treat, disinfect and safely handle drinking water under field conditions.

Use this calculator to determine the amount of chlorine to prepare a 1% chlorine solution and the amount of the 1% solution required to disinfect a batch of drinking water.

Use this calculator to determine the amount of chlorine product needed to prepare a 1% chlorine solution and the amount of the 1% solution required to to disinfect hand-dug wells and boreholes.

Use this Excel calculator to determine the amount of chlorine required to disinfect storage tanks and tankers through shock chlorination. This method is recommended for new tanks or when there is evidence of microbial contamination.

Turbidity, pH, and temperature can all impact how fast and how well chlorine products can disinfect drinking water. Challenge yourself as you manage a water delivery at a humanitarian camp; select and evaluate the required water parameter tests and learn how these parameters can affect chlorine dosage and contact time.

The Modified Horrocks' Test is a method of calculating the correct chlorine dosage for a known quantity of water. Follow along with Peter Thomson, senior director at CAWST as he conducts the Horrcks' test to calculate the correct chlorine dosage for a batch of drinking water.

This guide provides instructions for conducting the Modified Horrocks Test. This test is used to determine the effective chlorine dose for batch chlorination of drinking water.

Follow the guidelines in this poster to store and transport chlorine products safely. This poster is ideal for printing and placing in any location where chlorine products are handled and stored.

Follow the guidelines in this poster to handle and use chlorine products safely. This poster is ideal for printing and placing in any location where chlorine products are handled and stored.

Turbidity, pH, and temperature can all impact how fast and how well chlorine products can disinfect drinking water. Use this guide to determine how these parameters will affect your chlorine dosage and contact time.

Follow this guide to prepare a 1% chlorine solution that can be used for the Modified Horrock's Test and disinfection of the water supply.