Differentiating Between Total and Free Chlorine

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Hanna Instruments prides itself on its ability to help customers easily and accurately measure commonly required elements essential to their field including total and free chlorine.

It is important to note the difference between free and total chlorine. Free chlorine refers to available forms of chlorine, such as hypochlorous acid and hypochlorite, which are added to solutions for disinfection. When free chlorine combines with contaminants, it becomes combined chlorine, otherwise known as chloramines. Once chlorine is combined, it has a decreased ability to disinfect. The measure of total chlorine will always be higher than free chlorine, as it is the sum of both free chlorine and combined chlorine. Thus, measuring free chlorine is a direct indication of the effectiveness of sanitizing solution.

Hanna Instruments offers a wide range of instrumentation for measuring chlorine. From Chemical Test Kits (CTK) and Checker Handheld Colorimeters to single and multiparameter field meters and bench tops, Hanna has an accurate, affordable solution for nearly any free and total chlorine application.

Free Chlorine

Hanna’s Free Chlorine Test Kit HI38018 measures low and medium range (0.00-0.70ppm and 0.0-3.5ppm, respectively), however some customers may be interested in measuring a slightly higher range of free chlorine. Hanna offers a Free Chlorine Portable Photometer HI96701 which measures a range of 0.00-5.00ppm free chlorine.

Total Chlorine

The  Total Chlorine Ultra High Range Checker HI771 measures a medium to high range 0 to 500ppm Hanna’s Total Chlorine Test Kit HI3831T measures low to medium range 0.0-3.5ppm.

Chlorine, pH, & ORP Control

The Hanna PCA300 series chlorine analyzers continuously monitor, control, and adjust chlorine content and pH of  a sample stream. From drinking and wastewater treatment to pool and spa sanitation, monitoring chlorine levels has an important bearing on public health as well as ROI and efficiency for heating system and industrial applications.

More Hanna Products that Measure Chlorine: