This shower water filter uses a patented copper-zinc alloy, in a specially designed back-washable, replaceable cartridge. With this technology this filter has been shown to effectively remove 97+% of chlorine. It can also be helpful in removing iron, other heavy metals, and sulphur. It can help control the mold and mildew in your shower. It lasts about a year for two people showering under normal conditions. You absorb more chlorine through your skin in one shower than you typically absorb in your system from the chlorine you drink all day. Chlorine can make skin dry and flaky. It can make hair dry and brittle, and ruin hair coloring and permanents. Chlorine often irritates the eyes and lungs. The special interior design of the filter causes a "swirled", enhancing contact with the water which improves efficiency. A unique feature is the "Quick Flush" back-wash. Simply twisting the cartridge to the "Flush" mark will reverse the flow "back-wash" to release the sediment that can cause other filters to fail prematurely. Easy to install, simply unscrew your existing shower head from the shower arm and screw on the shower filter. Then screw on your shower head on the end of the shower filter. Must be used with a 2.5 gpm of water (or less) showerhead for best results (Showerhead not included). 
Overall dimensions: 6.7" tall X 3.75" diameter
Manufacturer of filter media: KDF Fluid Treatment
Technical questions: 800-437-2745, info@kdfft.com