Your shower water is not exactly pure water, so using a filter to neutralize its chlorine is not a bad idea. The UBS Vita Fresh Shower Filter helps you do just that. It uses Vitamin C as a dechlorinating agent. It has a transparent housing that allows you to see whether the filter is working. It can be used with mounted and handheld shower head designs.
The replaceable filter lasts for up to 10,000 liters. The above video shows how you can easily install the filter. More information is available here.