Premium Materials:Provide fresh and delicious-tasting water for coffee with the advanced ion-exchange resin and granular activated carbon. Before the filter is used for the first time, it is necessary to rinse the filter, just to rinse out the carbon dust. If it is started to rinse out the carbon dust, it is normal. Compatible Model: Replacement for Delongie filter models including ECAM, ETAM series coffee machines and conventional EX series pumped coffee machines. Easy installation: No tools required. For detailed instruction, please kindly refer to the Instruction Manual in the box. Recommendations: For best results and continuous refreshment, its recommended to replace your filter every 1-2 months, Extend the life of the machine by keeping the hoses clean. Package Content: 4x Replacement Water Filter for coffee machine.