AquaHomeGroup 20-Stage Premium Shower Filter Replacement Cartridge with Spin Propeller 2-Pack (No Housing) - Water Filter Refill Compatible with Any Shower Filter of Similar Design 15 and 20 StagesHEALTH CARE SHOWER SYSTEM Our shower cartridge has 20 stages of filtration that effectively soften hard water and reduce chemicals like chlorine, heavy metals, fluoride, lime and scale in water. MAXIMIZED SHOWER FILTRATION Innovative shower filter propeller creates a vortex, evenly spreading water for OPTIMIZED filtration and enrichment. EXTENDED WATER PURIFICATION Requires replacement once in 4 6 months (~ 10 000 gallons) depending on water quality