The Rainshowr RCCQ-A Shower Filter Replacement cartridge is engineered with an easy install pop-in design. The RCCQ-A water filter is tested and certified to NSF/ANSI Standard 177 for the reduction of free chlorine. You will see changes in the way your hair and skin feel. Your skin will look younger your hair will feel more manageable. This highly effective dechlorination provides relief from both dry skin and scalp as well as less fading in color-treated hair.