Use Duzzit Kettle Descaler regularly to keep your kettle free from limescale build up. Limescale build up on kettles can affect the performance and damage the heating element, thus shortening the working life of the kettle. These easy-to-use drop-in sachets from Duzzit are the perfect way to help avoid this build-up and help your kettle last for longer. Duzzit Kettle Descaler is safe to use for both plastic and metal kettles. Simply half fill the kettle with water and allow to boil, unplug the kettle and drop in a single sachet, leave for 10 minutes, empty the kettle, dispose of the sachet, re-fill and boil the kettle, dispose of the water leaving you with a perfectly clean kettle. Formulated to remove 100% of all limescale, prolonging the appliance life. Pack of 2 sachets. The Duzzit Drop-In Kettle Descaler removes 100% of limescale. Simply drop a sachet in the kettle to restore appearance and clean the interior.