The Grohe Blue activated carbon filter starter set gives you pure filtered drinking water straight from the kitchen tap, especially designed for soft water areas. For refreshing table water with no plastic bottles or plastic waste, the Grohe Blue activated carbon filter starter set is the answer. It is the ideal system for soft water areas (< 9° dKH). Using a multiphase filtration process, it reduces substances and impurities responsible for unpleasant taste and odor, such as chlorine. The process transforms source water into pure premium drinking water with a clean, fresh taste. The filter has a capacity of 1,500 litres (at 9° dKH), or six months of use. A filter exchange timer powered by two AA batteries lets you know when it is time to change the filter via an audible signal. Simply unscrew the used cartridge and screw in the replacement. The filter set is compact and designed to occupy a minimum of space in the under-sink cabinet. It is also compatible with all Grohe Blue Pure single faucets.