Replacement filter for Aquasana AQ-2100W Inline Shower Filter and Shower Head White Reduces over 90% of chlorine Official WaterSense labeled shower head 2.0 gallons per minute flow rate Recommended replacement : every 3 months. Enjoy softer skin and shinier smoother hair due to 90% chlorine reduction. Get a great shower and spa-like comfort with 2 spray settings. Consume less water annually -- save over 2,500 gallons. Easy install and filter change only twice a year -- no tools required. Installs on any 1/2" threaded shower arm. Functions only with shower filter in place. Item Weight 408 g Product Dimensions 20.3 x 8.9 x 6.4 cm Item model number AQ-2100W Size 20.3 x 8.9 x 6.4 cm Color White/Silver