What does coffee-machine water filter mean in practice?
It usually contains carbon and ion-exchange resin, so its capacity depends on water hardness and machine consumption.
When does it matter?
Over-softened or demineralised water can also impair extraction; the required composition follows the machine manufacturer’s specification.
Which solutions are related to it?
Measure hardness, enter it in the machine settings and replace the cartridge by volume, time and service indication.