Quick take
Choose a UV system with validated flow above the home’s realistic peak demand at the relevant dose condition. VIQUA’s current Arros line includes 9, 15 and 22 GPM classes for different whole-home demands.
Flow rate is tied to dose
A UV system should be evaluated at its validated treatment flow, not merely by chamber size or lamp wattage.
9 GPM class
VIQUA Arros 9 is rated 9 GPM and fits smaller residential demand when peak flow stays below that range.
15 GPM class
Arros 15 is rated 15 GPM and provides more margin for larger households or overlapping fixture use.
Pretreatment protects UV performance
Sediment, color and other water-quality issues can interfere with UV delivery. Whole-home UV is normally placed after upstream filtration so the chamber receives clearer water.