GROHE recommends that GROHE water systems including a filter are not left unused for a long period of time. If the GROHE filter systems are not used for a few days, the systems must be rinsed out with at least four liters of water.
If the GROHE Blue systems are not used for a period of about three weeks or longer, they must be cleaned with the GROHE Blue Xtra-Clean cleaning fluid and the filter replaced.
If you have a GROHE Blue Home Connect system, you can also activate the automatic flushing via the GROHE Ondus app so that the system is automatically flushed once within 24 hours.
Cleaning Process GROHE Blue Professional
Cleaning process GROHE Blue Home
Replacing the Filter - GROHE Blue Professional