This item should be replaced every two years, or when the display says "Replace RCI Cell" which ever comes first. This new RCI Cell utilizes the Honeycomb Matrix Catalytic Target and will work in your Ecoquest/Vollara Fresh Air 2.0 or 2.1. The RCI Cell includes a powerful UVX Bulb, which is simple to replace and has a long life expectancy.  Every cell is pre-tested prior to shipment.