Boiled water from my Philips kettle tastes like metal

1. Fill the kettle with water up to three-quarters of the maximum level and bring the water to the boil
2. After the kettle has switched off, add white vinegar (8% acetic acid) to the maximum level
3. Leave the solution in the kettle overnight
4. Empty the kettle and rinse the inside thoroughly
5. Fill the kettle with fresh water and boil the water
6. Empty the kettle and rinse it with fresh water again
7. Repeat the procedure if there is still some scale in the kettle.

Note: Regular descaling prolongs the life of the kettle.

If you dislike the smell of vinegar, use citric acid or a descaling agent. In that case, follow the instructions on the package of the descaler.