The specially developed lime filter cartridge by Swiss engineers from Laurastar filters the tap water before ironing and disinfecting. The anti-lime effect extends the lifespan of your iron or hygiene steamer. The salt protection effect improves steam quality. The rust protection effect maintains the components of the steam generator. The lime protection cartridge needs to be replaced when the red indicator light on your ironing station blinks. This product is compatible with Lift, Lift Plus, Lift Xtra, and IZZI.