The integrated limescale protection water filter is a particularly fast filter that can be used to filter tap water for ironing. Thanks to its limescale protection effect, it extends the lifespan of your iron. The salt protection effect improves steam quality. The rust protection effect helps maintain the components of the steam generator. The limescale protection granulate must be replaced as soon as it has completely turned brown. Suitable for the ironing systems Laurastar Pulse Silver, Laurastar Pulse, Laurastar S7a, Laurastar S6a, Laurastar S5a, Laurastar S4a, and Premium S3.