If you're looking to learn how to descale your ECM Classika PID, review the following. This article discusses how to descale single boiler machines and heat exchanger, or HX, espresso machines and will provide general information on how to do so.
Single boiler heat exchange machines can be descaled by the consumer. Since descaling is not the primary cleaning method for prosumer style machines it does not need to be done frequently. Descaling can be done on a 3-4 month basis, or whenever the machine starts to display flow issues. If hard water is being used in the machine, or the machine gets heavy usage, the machine may need to be descaled more frequently. The video below describes the process for descaling a single boiler heat-exchange machine.
How to Descale a Heat Exchange Machine