Haden STARBECK HK02010-US Manual De Instrucciones página 9

DESCALING
When the water is heated, the minerals in the water solidify creating
limescale which makes the water appear cloudy. As soon as you
notice a film forming on the water, or, when cleaning the filter, if you
notice a film on the walls or the element, descale the kettle and its
filter.
Limescale build-up will cause the element to overheat, reducing
its working life. It may also cause the safety cut out to operate
prematurely, switching the kettle off before the water boils.
To minimize scale build-up:
Half fill the kettle with tap water and add the juice of 1 lemon to
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the water.
Boil this mixture and allow it to stand for 15 minutes.
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Re-boil the mixture and allow it to stand a further 15 minutes.
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Re-boil this mixture a third time then rinse the kettle well.
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