Oust All Purpose Descaler is specially formulated to work quickly and easily to restore most small household appliances to their best in just 10 minutes its super fast action is ideal for use in kettles, coffee machines, steam irons and shower heads. It's important to descale appliances every 3 months in hard water areas and every 6 months in soft water areas. Because life's too short to spend it cleaning, Oust's range of products is designed to restore good-as-new shine and performance to your household appliance - no hassle, just great results. Recommended by one of the UK's leading kettle brands Russell Hobbs At the heart of your home