Upgrade your shower experience with the Aquasana AQ-4100NSH Shower Filter, trusted by dermatologists and loved by customers for noticeably healthier hair, softer skin, and a cleaner shower environment. Designed with advanced filtration technology and tested to NSF-177 standards, this high-performance system reduces more than 90% of chlorine for a refreshing, spa-like shower every day—all while allowing you to keep the shower head you already love.