AquaHomeGroup 20 - Stage Replacement Premium Filter Cartridge 2-pack (No Housing), Compatible with Any Shower Filter of Similar Design 15 and 20 stagesHEALTH CARE SHOWER SYSTEM: Our cartridge has 20 stages of filtration that effectively reduce chlorine, heavy metals, fluoride, lime and scale in water. WATER PURIFIER: Requires replacement once in 4 6 months (~ 10 000 gallons) depending on water quality and frequency of use. Use the whole family and dont worry about the soon shower cartridge replacement. REVITALIZING BODY: Reduces dry skin, dandruff. Cares about the skin, hair, and nails.