JURA Blue 24231 Claris Filter Cartridge Set of 3, PlasticFeatures Claris filter cartridge specially developed for Jura espresso coffee machines. Always freshly filtered coffee water before each preparation. Descaling is completely unnecessary with Claris filter cartridges. New plus formula stabilises water in the tank and prevents limescale deposits. Thanks to RFID technology, automatic filter detection for all devices with the intelligent water system (I. W. S. ). Product Description JURA Blue 24231 Claris