For ReFa Shower Heads Two-layer cartridge for clean, clear water With its unique two-layer cartridge, this product continuously addresses residual chlorine and impurities in the water, resulting in clean, clear water. The upper layer of calcium sulfite reduces chlorine, while the lower layer of composite fiber filter removes dirt. Reduce chlorine in your daily shower time for beautiful hair. #ReFa #ShowerHead #Cartridge #ChlorineRemoval