Inspired by professionals and designed for connoisseurs, KRUPS products have been built with three key attributes in mind: Passion, Precision and Perfection. To optimize the taste of your coffee and the lifetime of your appliance, we recommend that you use the KRUPS F088 Water Filtration Cartridge. It consists of an anti-scale substance and active carbon which reduces the chlorine, impurities, lead, copper and pesticides in the water. The minerals and trace elements in the water, however, are preserved.The KRUPS F088 Water Filtration Cartridge is to be used with KRUPS Precise Tamp espresso machines and fully automatic machines. We recommend you change the filter at least every two months.