Overview

In the water treatment industry where disinfectants are used, we often hear about residual chlorine and total chlorine. Are they the same? Can a free chlorine sensor be used to monitor total chlorine? Today, we will explore the differences between residual chlorine and total chlorine.

1. Different Definitions

Residual chlorine refers to the content of free chlorine in water, which is the residual amount of disinfectants (such as chlorine gas, sodium hypochlorite, etc.) in water. Residual chlorine can effectively kill bacteria, viruses, and other microorganisms in water to ensure the safety of water quality.

Total chlorine refers to the sum of free chlorine and combined chlorine in water, including free chlorine, sodium hypochlorite, hypochlorous acid, chloride, etc.

2. Different Purposes

Total chlorine is an index to measure the chloride content in water and evaluate the degree of organic pollution in water quality. Measuring total chlorine can help determine whether there is enough disinfectant in the water.

Residual chlorine, on the other hand, is used as a disinfectant, and measuring residual chlorine helps determine whether the residual amount of disinfectant is appropriate.

3. Different Values

The measurement of total chlorine is usually greater than the measurement of free chlorine because total chlorine includes all chloride compounds, while free chlorine only includes chlorine that is not consumed.

4. Different Monitoring Occasions

A residual Chlorine Sensor monitors residual chlorine and is mainly used in water treatment processes, such as water plants, swimming pools, and drinking water processing.

A Total Chlorine Sensor monitors total chlorine and is primarily used in environmental monitoring and water quality assessment, such as the monitoring of rivers, lakes, oceans, and pollution sources like industrial wastewater and agricultural discharge.

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Although there are many differences, residual chlorine and total chlorine are also related in practical applications. Because residual chlorine is the part of free chlorine in total chlorine, in some occasions, it is necessary to monitor the values of both residual chlorine and total chlorine simultaneously to fully understand the water quality. Our company provides both chlorine sensors and total chlorine sensors, along with matched controllers.

Our Water Quality Analysis Instruments

Our company focuses on the R&D, production, and sales of water quality analysis instruments. Our main products include:

• Online pH ORP analyzer
• Conductivity analyzer
• Turbidity analyzer
• Dissolved oxygen analyzer
• COD analyzer
• Ammonia analyzer

If you need water treatment-related products, please contact us.