Grohe Blue Carbon Filter, S-Size 40404GROHE Blue Filter great taste, pure water The GROHE Blue S size filter (capacity 600 l at 20 dKH) turns ordinary tap water into a premium table water. Through five purification phases, the water is continually refined into a soft potable water with a wonderful taste. Undesirable substances, fine particles and heavy metals are filtered out and the lime content is reduced, leaving pure, great tasting water. The filter cartridge is easy to replace