This anti-scale water filter for ironing is an ultra-fast external filter which allows you to filter tap water before it is used for ironing. By preventing limescale, it prolongs the life of your iron. By filtering salts, it improves steam quality. Anti-corrosive, it also prevents damage to boiler components. Anti-scale granules should be replaced when they turn completely brown. Refills are available on our e-shop, by calling Laurastar Consumer Service or in selected Laurastar partner stores.