Cyanuric acid

Cyanuric acid (CYA) is best known as a stabilizing reagent for chlorine. It is widely applied in swimming pool and spa treatment programs to slow down the decomposition of hypochlorous acid. In outside pool areas, this process is accelerated by the effects of UV rays. When applied properly it can save up to 80% of normal chlorine consumption in pools during peak months. Cyanuric acid is also used in chlorinated bleaches, selective herbicides, and whitening agents.

The test for cyanuric acid uses the turbidimetric method. Any cyanuric acid in the sample is precipitated out of solution and held in suspension. The amount of turbidity caused by the suspended particles is directly proportional to the amount of cyanuric acid in the sample.


Hanna Instruments offers a variety of technologies to measure cyanuric acid. Spectrophotometers and benchtop photometers can measure a wide variety of other water quality parameters that are important for swimming pools and spas. Portable photometers are also available with multiple parameters.



Spectrophotometers are available that have cyanuric acid method pre-programmed into the meter. The spectrophotometer offers the highest precision due to the quality of the optical system that has a wavelength accuracy of +/- 1.5 nm. The spectrophotometer allows for custom methods to be developed.



Benchtop Photometers

Benchtop photometers include multiparameter versions for the laboratory and swimming pools and spas. Each photometer is customized to have the parameters used by a specific industry. All benchtop have a digital pH electrode input allowing it to be used as a traditional pH meter.



Portable Photometers

Single and multiple parameter portable photometers are available. The portable photometers have a CAL Check feature that allows for performance verification and if needed, recalibration using the CAL Check standards. The portable meters are available as a meter only or as a kit. The kit version include a rugged carrying case and CAL Check standards.




Reagents used with the portable and benchtop photometers.




Solutions for cyanuric acid measurement include the CAL Check standards for verifying and, if needed, the calibration of our portable photometers. Each CAL Check standard is supplied with a Certificate of Analysis stating the accuracy and traceability of the standard.



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