Chlorine Test Paper measures the total available chlorine from 0-200ppm. Total available chlorine is the sum of free available chlorine and the combined available chlorine. When using bleach as a cleaner, it must be diluted before use, and it will work best in the pH range of 5-7.
NOTE: The strip will darken over time, so it is best to compare it to the colour chart as directed. In addition, if two strips are stuck together, the colour will be darker. Lastly, if you lay the strip against the vial when comparing it to the colour chart, it will also darken the colour. The colour chart was created by holding a strip in the air next to the vial.