The inline water filter cartridge fits brita 3 way tap models titanium rosedale and solo nebula the brita inline cartridge reduces limescale chlorine and impurities for fresh clear great tasting water each inline cartridge lasts approximately 3 months thats 4 a year fits descreetly horizantally or vertically under the sink can be exchanged in minutes tool free and without turning off your water each cartridge is recyclable