Take a representative sample of the sanitizing solution with the help of a beaker and proceed to make the measurement with the test strip.
Once the measurement has been taken, eliminate the sampled solution (do not reintroduce it into the solution used to disinfect the vegetables). When the indicator paper is dipped in the disinfectant solution, it produces an immediate color reaction.
This color should be compared with the colors in the reference table at different chlorine concentrations.
The points indicated on the color scale are for concentrations of 10 - 25 - 50 - 100 - 200 ppm free chlorine.

The Chlorine ppm determination kit consists of a dispenser with a color chart and a 15'x5/32” roll of indicator paper.
Each kit contains enough indicator paper to perform more than 150 tests.