Grohe Blue Carbon Filter, S-Size - 40404Grohe Blue Carbon Filter, S Size 40404 Replacement carbon filter designed to improve water taste and reduce hardness for GROHE Blue systems. Features Improves water taste and reduces water hardness Reduces chlorine taste and odor Helps reduce trace substances such as pesticides 5 stage filtration process for cleaner drinking water Filters out fine particles and heavy metals Activated carbon and ion exchanger resin technology Maintains essential