All Breville kettles come with a filter in. Some are removable, and some are permanent. The filter is there to prevent the build up of limescale and other impurities.
For hard water areas, we have a range of Breville BRITA Filter kettles. Using a mixture of carbon and ion exchange resin, the BRITA filter removes hardness, chlorine, heavy metals and other organic impurities from your water to improve its taste, smell and appearance.