To calibrate the aquarium pump please follow these steps:
Make sure the difference in height between the KH Keeper and the reagent container is not greater than 20 cm.
Put the reagent nozzle coming from the pump to the measuring beaker
Fully fill the tubes using FILL THE CIRCUIT button
Please empty the measuring beaker if any liquid is present
Start the calibration process
When the pump stops please measure the amount that it is in the beaker and put the value in the box
Check if the pump is calibrated correctly.
To do this put the tube into the empty measuring cup and use TEST THE ACCURACY button. The difference should not be greater than 0,05 ml.
Here is the video about the calibration: