Filtration This activated carbon water filter cartridge is designed for coffee machines. It effectively removes impurities and unhealthy substances from your water while retaining beneficial minerals, delivering better tasting coffee for any brew experience. Limescale prevention Designed to prevent and reduce lime scale buildup inside your machine. Keeps internal espresso components clean, supports automatic operation, and helps extend appliance life by maintaining performance. Certified materials Constructed with NSF and FCM certified foodgrade materials. Our coconut shell activated carbon filtration provides reliable performance and safe daily filtration for your coffee preparation. Recommended replacement cycle For consistent filter performance we suggest replacing this CA6903 compatible water filter every 36 months, though actual frequency may vary based on local water quality and coffee machine usage patterns. Use scenarios Daily home coffee brewing with standard tap water to improve flavor and protect the machine. Hard water regions to reduce lime scale deposits and maintain machine efficiency. Office or small café setups with multiple machines, ensuring consistent water quality across brewing sessions.