Duo Genuine Shower Filter Replacement Cartridge, NSF Certifed (3+1) Fits Duo only, up to 8,000 gallons per cartridge, easy tool-free twist-on install, reduces chlorine, NSF certified

WHY FILTERED WATER MATTERS: Unfiltered water can contain harmful contaminants like chlorine, PFAS, and microplastics, which may lead to skin dryness, irritation, and scalp problems. Long-term exposure to these pollutants has been linked to potential health risks, including hormonal disruption and skin conditions. By filtering these out, Duo ensures you experience cleaner, healthier water for a noticeable difference in your skin, hair, and overall well-being.
GENUINE REPLACEMENT CARTRIDGES: Duo Replacement Cartridges are designed exclusively for the Duo Shower Filter system, ensuring a perfect fit and consistent filtration performance with every replacement cycle.
THREE REPLACEMENT OPTIONS AVAILABLE: Choose the right refill pack for your needs: 1+1 Full Set for a single replacement, 2+2 Twin Pack for double replacements, or 3+1 Extended Pack for added longevity and extra sediment filter coverage.
EASY TWIST-IN REPLACEMENT SYSTEM: Designed for quick, tool-free replacement, each cartridge set installs in minutes. Simply twist open the housing, replace the color-matched filters, and secure back in place with no tools required. LONG-LASTING FILTER LIFE WITH VISUAL MONITORING: Each cartridge set lasts up to 8, 000 gallons depending on water conditions. Transparent housing allows easy visual monitoring so you know exactly when its time to replace your filters