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Measurement: Cyanuric Acid
 
 
C401/301/201/102/101 
 
 
 
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be accurately prepared, or measured by a different method or instrument 
of higher precision and accuracy, then a Cyanuric Acid standard in the 66-
75 ppm range can be used. Please refer to section 3.3 Cyanuric Acid for 
details. 
2.5.5 Chemistry 
Cyanuric Acid is commonly used to stabilize the chlorine present in 
swimming pool water.  With correct pool maintenance, Cyanuric Acid 
build-up is uncommon; however, if correct maintenance is not carried out, 
the levels may build up until potentially harmful. 
In the test method, the Cyanuric acid reacts with the sachet reagent, in a 
conditioned sample, to produce a suspended turbidity. 
The amount of turbidity produced is proportional to the concentration of 
Cyanuric Acid.  The amount of 525nm light absorbed/scattered by the 
turbidity is accurately measured by the meter and then converted into the 
Cyanuric Acid concentration.