Flowmatic brand shower filter for chlorine reduction features our dial-a-date ring indicator for an easy to remember change reference. These filters are filled with 100% KDF-55 media for high efficiency. FMSHWR-KDF55 Shower Filter in Retail Box Description: High quality, user friendly in-line dial-a-date shower filters with 100% KDF-55 media for chlorine reduction. Will not rust or corrode.