1-3 MONTHS CONTINUOUS EFFECTIVENESS - Introducing the Ophanie 2 Pack Replacement Cartridges designed for SHF3 model showerheads. With each cartridge lasting 1-3 months this convenient package provides a continuous supply for up to six months ensuring your shower water remains pure and energized. SEAMLESS INSTALLATION FOR UNINTERRUPTED LUXURY - With a focus on user convenience the Ophanie 2 pack replacement cartridges offer easy installation so you can enjoy the benefits of clean filtered water without any hassle. No tools are required for the replacement process. Simply remove replace and embrace a peaceful showering experience that restores body and mind. EXQUISITE PURIFICATION - Say goodbye to residual chlorine heavy metals and bacterial pathogens in your shower water.Ophanie replacement cartridges utilize an advanced filtration system that effectively eliminates impurities and contaminants providing peace of mind and a refreshing shower experience that awakens the senses. RENEW HAIR SKIN AND NAI