It's gentle on hair and skin.
The excess chlorine in water that's added for sterilization also strips the proteins that make up your hair of oxygen, damaging your hair strands. Also, if you use the same plain tap water at a warm temperature, the chlorine melts the lipids in your skin which construct the important barrier against outside elements and dries out your skin faster.
This is a set of two replacement cartridges for the Cleansui Dechlorinating Shower Head (see compatible models below). This series dechlorinates water for a shower that's gentle on your hair and skin. Each cartridge has about a 4-month lifespan.
SY101, SY102, SD104