Grohe Blue Pure StartCurve water purifier kit for kitchen sink mixer + filterGrohe Blue Pure StartCurve water purifier kit for kitchen sink mixer + filter Grohe Blue Pure StartCurve has the function of filtering water thanks to its separate knob from the one used for unfiltered water, simplifying and increasing the pleasure of drinking. Clean, essential lines blend into a contemporary aesthetic that adapts perfectly to any kitchen style: from minimalist to a revisited classic. The presence of two independent handles ,