I live in a hard water area and have always liked glass kettles. Now it seems I can have one as this kettle filters the water. The insertion of the filter was straight forward as the instructions were clear. Although there is a slight delay between adding the water and putting the kettle on - as the water needs to  be filtered, this is very minimal. I am probably more aware now only to put in the amount of water needed into the kettle  too so this will reduce energy costs. I am delighted that I won’t be descaling a kettle every few weeks. The kettle itself is very attractive and functional. The water is easy to pour in and out and I enjoy seeing the water bubbling.