Scale from heated water
Each time you heat water some evaporates and leaves the dissolved minerals on the inner surface of the kettle and the coffee machine tank, forming a hard white or grey layer. Over time heating becomes less efficient, boiling takes longer and the appliance gets louder.
The thickness depends on the water used and how often you heat it, which is why regular checks beat waiting until white flakes appear in the tea or coffee.
Signs of scale buildup
- White flakes floating in water or coffee.
- Longer boil times or weak pressure in the coffee machine.
- A hard white layer on the element or the kettle base.
- A louder boiling sound than usual.
