Remove harmful chlorine, iron, lead, mercury, hydrogen sulfide from water and reduce bacteria. As a result, your hair, skin, and lungs can be protected from damage. A cartridge usually runs for 1 year but depends on the usage. There are arrangements for soft-to-forced settings. It is lowes shower head filter. The speed of water flow is usually 2.5 g.p.m. It is easy to set up. There is five years limited warranty. So can buy.