The VIQUA S320RL-HO UV lamp should be replaced every 12 months (once per year) to ensure effective disinfection performance. Even if the lamp still appears to be glowing, its UV-C output degrades significantly after 9,000 hours of continuous operation, which can compromise its ability to inactivate bacteria, viruses, and cysts. Replacing the lamp annually keeps your VIQUA UV system operating at peak germicidal efficiency.

The VIQUA S320RL-HO is a genuine OEM high-output (HO) replacement UV lamp specifically designed for VIQUA Sterilight Silver Series SHO and Pro Series PRO10 UV systems, including models SHO, SHF-180, SHFM-180, SSM-24, and SC-320. It is not a universal lamp—using it only in its designated VIQUA housings ensures the correct UV dose and flow rate performance.

The VIQUA S320RL-HO high-output lamp is engineered to deliver a NSF-validated UV dose of 40 mJ/cm² at a flow rate of up to 20 GPM, and a Class B dose of 30 mJ/cm² at up to 24 GPM. This makes it ideal for whole-house disinfection applications requiring treatment of microbiologically unsafe water without the use of chemicals.

Yes. The VIQUA S320RL-HO is used in UV systems validated to NSF/ANSI 55 Class A and Class B standards for microbiological water treatment. Class A systems are designed to disinfect microbiologically contaminated water, while Class B systems are intended for supplemental bactericidal treatment of already potable water.

While the VIQUA S320RL-HO UV lamp itself should be replaced every 12 months, the quartz sleeve surrounding it typically needs to be replaced every 2 to 3 years, or sooner if it shows signs of scaling, fouling, or cracking. A clean, intact quartz sleeve is essential because any buildup reduces UV transmittance and diminishes the lamp's disinfection effectiveness. Inspect the sleeve each time you change the lamp.