Used once The Genuine GROHE Blue Magnesium + Zinc filter 40691002 is a high-quality water filter cartridge designed specifically for Grohe Blue systems. Made of durable plastic, this 5-stage filter uses activated-carbon filtration, carbon block, ion exchanger, and activated-carbon methods to effectively remove chlorine taste and odor, ensuring clean and great-tasting water for household use. With a capacity of 400L, this filter is compatible with Grohe systems and is a reliable choice for maintaining the purity of your water supply. Manufactured in Austria by the trusted brand Filter, this blue cartridge is a crucial component for your water purification system.