Descaling system, but which one..... AquaStop?

better something with names

There are various international manufacturers who, for example, install Fleck (Pentair) or Clack valves. Both companies are leaders in this field and these names are more well-known worldwide than Grünbeck or Judo. Therefore, even non-German systems have quite solid quality installed.

There are various international manufacturers who install, for example, Fleck (Pentair) or Clack valves. Both companies are leading in this field and worldwide these names are bigger than Grünbeck or Judo. Therefore, non-German systems also have decent quality installed.

No, but it is about service and maintenance. If the local region is not available, I would leave it.