The anti-scale granules allows you to filter tap water before it is used for ironing. The granules prolong the life of your iron by preventing limescale. Steam quality is improved by filtering salts and by being anti-corrosive, it also prevents damage to the boiler components within the ironing system. By removing extra calcium and minerals, the life your iron, garments, and fabrics are prolonged with the use of the Laurastar anti-scale granules. The granules should be replaced when they turn completely brown.Suitable for the integrated anti-scale filter in the following ironing systems: Laurastar Pulse, S7, 6, S5, S4, Premium S3, G5 and G4. FeaturesThe anti-scale granules allows you to filter tap water before it is used for ironing. The granules prolong the life of your iron by preventing limescale. Steam quality is improved by filtering salts and by being anti-corrosive, it also prevents damage to the boiler components within the ironing system. By removing extra calcium and minerals, the life your iron, garments, and fabrics are prolonged with the use of the Laurastar anti-scale granules. The granules should be replaced when they turn completely brown.Suitable for the integrated anti-scale filter in the following ironing systems: Laurastar Pulse, S7, 6, S5, S4, Premium S3, G5 and G4.