How is the concentration measured?


Hypochlorous acid is measured with the same standard test strips that measure free chlorine in a pool. The test strips will turn a different shade of purple to indicate the concentration between 10 and 200 ppm. For higher concentrations, the solution being tested can be diluted. (Example: A 1000 ppm solution could be diluted at a 1:10 ratio. A test strip would then read 100 ppm indicating the original solution was 1000 ppm.)