Duo Genuine Shower Filter Replacement Cartridge, NSF Certifed (2+2) | Fits Duo only, up to 8,000 gallons per cartridge, easy tool-free twist-on install, reduces chlorine, NSF certified

Compatible Replacement Cartridges: These replacement cartridges are designed specifically for the Duo Shower Filter system, ensuring a proper fit and reliable filtration performance with each replacement cycle.
Maintains Cleaner Shower Water Performance: Each replacement set continues to reduce chlorine, PFAS, and particulates, helping maintain cleaner shower water that supports healthier-looking skin, scalp, and hair over time.
Three Replacement Options Available: Select the appropriate refill pack for your requirements: 1+1 Full Set for a single replacement, 2+2 Twin Pack for double replacements, or 3+1 Extended Pack for extended use and additional sediment filter coverage.
Easy Twist-In Replacement System: Engineered for fast, tool-free replacement, each cartridge set installs in minutes. Simply twist open the housing, replace the color-matched filters, and secure it back in place without any tools needed. Long-Lasting Filter with
Visual Monitoring: Each cartridge set provides up to 8, 000 gallons of use depending on water conditions. The transparent housing allows for simple visual monitoring so you know precisely when it's time to replace your filters