Pool water test kit

A test kit is used to check the free chlorine and pH of the pool water. Some test kits also measure total chlorine, total alkalinity, calcium hardness and cyanuric acid.


The DPD test kit is available in a manual version, in which the test water is compared with a colour scale, and a photometric version, in which the value is displayed digitally to two decimal places.


Every test kit is supplied with test tablets as follows:

  • DPD no. 1 measures free chlorine
  • DPD no. 3 measures total chlorine
  • Phenol red measures pH


Where the chlorine level is above 6 ppm (mg/l) the test water is bleached. The result may then indicate that there is no chlorine in the pool. If you suspect this, you can dilute the test water with ordinary tap water.


Avoid touching the test tablets with your fingers as this may cause incorrect results.

To obtain accurate readings, it is important to have a good measuring instrument.