DeLonghi KB Series Instructions For Use Manual page 8

Scale
Scale is mainly calcium carbonate (chalk), a harmless,
naturally occurring mineral found in most water supplies.
"Hard" water contains more of this mineral than "soft" water.
When the water is heated, the minerals in the water solidify,
making the water appear cloudy. These minerals form a thin
film on the walls, element and on the surface of the water.
The water may look like it has white coloured pieces of plastic
floating on the surface. On traditional kettle elements,
scale forms a hard white "crust" which adversely affects
performance and reduces the life of the element. As soon
as you notice a film forming on the water, or on the interior
walls of the kettle, simply rinse the kettle and wipe it out.
Scale filter
Your kettle is fitted with a scale filter to prevent loose
particles of scale being poured into your beverage. This filter
is both removable and washable. The frequency with which
you will need to clean any scale deposits from your filter will
depend on the hardness of water in your area and how often
you use the kettle. You should remove and clean the water
filter when you notice any deposits being left on the filter or
if the pouring efficiency is impaired.
Removing the scale filter
• Allow the kettle to cool down fully.
• Disconnect the appliance from the mains electrical
supply.
• Make sure that your hands are clean and free from soap,
cream or anything which might taint the water.
• Empty the kettle and remove the filter as shown in
figure 1.
• Rinse under a tap while brushing with a soft brush (fig.
2).
• Replace the filter (fig. 3).
Descaling
It is vital to clean and descale the kettle and filter regularly in
order to maintain it in good working order. Failure to descale
your kettle may invalidate your guarantee.
• It is recommended to use specific (store bought)
products for descaling of kettles.
• When limescale starts to build up on the heating
element, buy a suitable descaler and descale your
kettle. After descaling, boil with fresh water several
times and discard. Clean any descaler off the kettle – it
can damage the parts.
• If the filter requires descaling, remove the filter and
place into the kettle whilst descaling.
• Ensure that the electrical connections are completely
dry before using the kettle.
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