Brand New with seal. Never used. AQ-45 Replacement filter for all Aquasana Shower Filters to reduce over 90% of chlorine. Used this brand for 30+ years until we moved to home that has its own water filtration system. From the Aquasana website: Water You Can Trust Using patented Copper-Zinc (KDF) and eco-friendly coconut shell carbon media, our Shower Filter reduces over 90% of chlorine. Easy Replacements Expertly engineered for the easiest replacement. Simply twist off, replace, and screw back on – no tools or plumber required. Value & Convenience Fewer filter replacements, more clean, filtered water. One shower filter gives you 6 months of refreshing showers.