Grohe Blue Filter With Filter Head - 40438Grohe Blue Filter With Filter Head 40438 Water filtration system designed for GROHE beverage faucets to improve taste and reduce hardness. Features Designed for use with GROHE Zedra Beverage Faucet (30 026) Includes GROHE Blue Filter (40 404 001) and filter head Improves water taste and reduces water hardness Five stage filtration system for cleaner drinking water Removes sand, dirt, chlorine, organic compounds, and heavy metals Ion exchanger reduces