What it is: A replacement filter for your hand-held showerhead that helps you experience pure water for clinically proven healthier hair.What it does: The T3 Source collection removes up to 95% of damaging chlorine from shower water, which helps to improve hair health and color retention while helping your skin maintain moisture and giving it a noticeably softer, smoother and healthier appearance. How to use: To ensure your filtration unit is operating at peak performance, replace the filter every 3,000 gallons, in three to four months or when the color indicator turns black. Reverse the filter monthly for best results. Includes 2 filter refills