The G30 sparge water counter works as a manual counter.
Each time you add a volume of sparge water use the arrow keys on the controller (or app) to set the volume added to the boiler.
This feature is there to help you remember how much sparge water you have added, as we can all get distracted during our brew day!
Note: The feature is enabled on the app and controlled on the controller manually using the up and down arrows.