The inert cartridge system when metal ions must be excluded: EcoCART® is a easy-to-handle and fully inert glass cartridge system for narrow bore HPLC with a broad range of filling materials available. The small inner diameter of 3 mm produces almost twice the peak height in comparison to 4 mm ID columns and increases therefore the detection sensitivity significantly. At the same time eluent consumption is halved. The transparent tube allows the separation of coloured substances to be followed with the naked eye. Impurities at the column head can be recognised at an early stage. The extremely smooth glass surface is ideal for HPLC and involves no restrictions whatever regarding the eluents used. The EcoCART® system is fully compatible to the manu-CART® “4” system.