This 48W UV replacement bulb lamp (AF-UV18HO-BULB) is compatible with Aquasure 18 GPM High Output UV disinfection system (AS-UV18HO), Aquasure Multi-stage UV Water Filtration System (AS-WHUV18HO), and Aquasure Harmony Series Whole House Water Softener & GAC/KDF85 Conditioner Bundle (AS-SE1500FMU).With an approximate 1-year lamp life (9,000 hours), the Aquasure Quantum Series 18 GPM Ultraviolet Replacement Bulb Lamp keeps your Aquasure UV water sterilizer system running smoothly while protecting your home's water supply from harmful bacteria and viruses.