Safe Chlorination of Drinking Water

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.

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.

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.

Use this calculator to determine the chlorine needed for disinfecting wells, drinking water, and storage tanks. Read instructions before use.

This guide provides instructions on the correct use of a pooltester kit to measure pH, free residual chlorine (FRC) and total chlorine (TC).

Step-by-step instructions for using a turbidity tube to measure how cloudy water is and determine if pre-treatment may be needed before disinfection.

This product sheet has a product description, distributor information, availability, cost, storage, and maintenance information about turbidity tubes.

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.

This is a package of all the trainer essentials used in the Delivering Effective WASH Training Workshop.

How do you prevent and treat contaminated drinking water? Learn about the multi-barrier approach to ensure that water is safe to drink.

This technical brief describes different types of chlorine products available for household water disinfection, and how chlorine inactivates microorganisms in water. It provides guidelines for chlorine use, including safety considerations and methods for calculating appropriate doses.

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.

Learn how to correctly measure turbidity using a turbidity tube.

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.

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 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.

This fact sheet describes disinfection of drinking water using a Venturi inline chlorinator.

This fact sheet describes disinfection of drinking water using a T-Chlorinator.

This fact sheet describes disinfection of drinking water using a Slow Release Tank Chlorinator.

This technical brief gives some steps you can follow to identify, evaluate, and test household water treatment and safe storage (HWTS) options with your potential user group. It describes criteria you can use to assess the appropriateness of different HWTS options for your context. It also explains why HWTS selection should take place within a multi-barrier approach to safe drinking water.

A fact sheet debunking common fears about chlorinated drinking water, backed by WHO guidance — for WASH trainers, educators, and community promoters.