CLARIS filter cartridge Water with a high lime content can become the enemy of your coffee machine. Limescale forms in the form of scale in the thermoblock. These deposits clog the pipes. The filter cartridge can be used in all IMPRESSA line machines and is inserted directly into the water tank. CLARIS plus does not use any chemical additives. Ion exchangers and activated carbon reduce limescale deposits, heavy metals and other pollutants as well as substances that impair taste and odor. CLARIS plus works according to the professional upflow principle. Only the amount of water drawn in by the machine and required for preparing the beverage is filtered immediately before use. 4 pieces: Art. 62911